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Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2018	Apr. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	GLDD
Entity Registrant Name	Great Lakes Dredge & Dock CORP
Entity Central Index Key	0001372020
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		62,227,612

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 12,736	$ 15,852
Accounts receivable—net	97,441	75,533
Contract revenues in excess of billings	55,122	90,788
Inventories	33,052	34,600
Prepaid expenses and other current assets	40,933	45,411
Total current assets	239,284	262,184
PROPERTY AND EQUIPMENT—Net	381,762	407,294
GOODWILL AND OTHER INTANGIBLE ASSETS—Net	84,334	84,484
INVENTORIES—Noncurrent	54,906	54,023
INVESTMENTS IN JOINT VENTURES	1,963	2,714
ASSETS HELD FOR SALE—Noncurrent	8,463	8,530
OTHER	17,546	13,128
TOTAL	788,258	832,357
LIABILITIES AND EQUITY
Accounts payable	72,093	87,659
Accrued expenses	52,284	56,218
Billings in excess of contract revenues	8,772	3,615
Current portion of long-term debt	1,379	2,758
Total current liabilities	134,528	150,250
LONG-TERM DEBT	321,280	333,141
REVOLVING CREDIT FACILITY	91,000	95,000
DEFERRED INCOME TAXES	21,870	25,561
OTHER	8,078	7,109
Total liabilities	576,756	611,061
COMMITMENTS AND CONTINGENCIES (Note 9)
EQUITY:
Common stock—$.0001 par value; 90,000 authorized, 62,485 and 61,897 shares issued; 62,207 and 61,619 shares outstanding at March 31, 2018 and December 31, 2017, respectively.	6	6
Treasury stock, at cost	(1,433)	(1,433)
Additional paid-in capital	290,298	289,821
Accumulated deficit	(77,999)	(67,101)
Accumulated other comprehensive income	630	3
Total equity	211,502	221,296
TOTAL	$ 788,258	$ 832,357

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	62,485,000	61,897,000
Common stock, shares outstanding	62,207,000	61,619,000

Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Contract revenues	$ 146,593	$ 170,586
Costs of contract revenues	131,888	155,774
Gross profit	14,705	14,812
General and administrative expenses	15,944	16,795
(Gain) loss on sale of assets—net	(199)	11
Operating loss	(1,040)	(1,994)
Interest expense—net	(8,660)	(5,582)
Other income (expense)	(2,916)	209
Loss from continuing operations before income taxes	(12,616)	(7,367)
Income tax benefit	3,295	2,793
Loss from continuing operations	(9,321)	(4,574)
Loss from discontinued operations, net of income taxes		(13,065)
Net loss	$ (9,321)	$ (17,639)
Basic loss per share attributable to continuing operations	$ (0.15)	$ (0.07)
Basic loss per share attributable to discontinued operations, net of tax		(0.21)
Basic loss per share	$ (0.15)	$ (0.28)
Basic weighted average shares	61,815	61,065
Diluted loss per share attributable to continuing operations	$ (0.15)	$ (0.07)
Diluted loss per share attributable to discontinued operations, net of tax		(0.21)
Diluted loss per share	$ (0.15)	$ (0.28)
Diluted weighted average shares	61,815	61,065

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2018

Mar. 31, 2017

Statement Of Income And Comprehensive Income [Abstract]

Net loss

$ (9,321)

$ (17,639)

Currency translation adjustment—net of tax

^[1]

1,361

(28)

Net unrealized gain on derivatives—net of tax

^[2]

(734)

Other comprehensive income (loss)—net of tax

627

(762)

Comprehensive loss

$ (8,694)

$ (18,401)

[1]	Net of income tax (provision) benefit of $(535) and $39 for the three months ended March 31, 2018 and 2017, respectively.
[2]	Net of income tax (provision) benefit of $260 and $(479) for the three months ended March 31, 2018 and 2017, respectively.

Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Currency translation adjustment, tax	$ (535)	$ 39
Net unrealized gain on derivatives, tax	$ 260	$ (479)

Condensed Consolidated Statements Of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
BALANCE - value at Dec. 31, 2016	$ 247,890	$ 6	$ (1,433)	$ 286,303	$ (35,841)	$ (1,145)
BALANCE - shares at Dec. 31, 2016		61,240	(278)
Share-based compensation, value	918			918
Share-based compensation, shares		109
Vesting of restricted stock units, including impact of shares withheld for taxes, value	(164)			(164)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares		69
Exercise of options and purchases from employee stock plans, value	434			434
Exercise of options and purchases from employee stock plans, shares		132
Net loss	(17,639)				(17,639)
Other comprehensive income (loss)—net of tax	(762)					(762)
BALANCE - value at Mar. 31, 2017	230,677	$ 6	$ (1,433)	287,491	(53,480)	(1,907)
BALANCE - shares at Mar. 31, 2017		61,550	(278)
BALANCE - value at Dec. 31, 2017	221,296	$ 6	$ (1,433)	289,821	(67,101)	3
BALANCE - shares at Dec. 31, 2017		61,897	(278)
Cumulative effect of recent accounting pronouncements	(1,577)				(1,577)
Share-based compensation, value	1,009			1,009
Share-based compensation, shares		40
Vesting of restricted stock units, including impact of shares withheld for taxes, value	(936)			(936)
Vesting of restricted stock units, including impact of shares withheld for taxes, shares		430
Exercise of options and purchases from employee stock plans, value	404			404
Exercise of options and purchases from employee stock plans, shares		118
Net loss	(9,321)				(9,321)
Other comprehensive income (loss)—net of tax	627					627
BALANCE - value at Mar. 31, 2018	$ 211,502	$ 6	$ (1,433)	$ 290,298	$ (77,999)	$ 630
BALANCE - shares at Mar. 31, 2018		62,485	(278)

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING ACTIVITIES:
Net loss	$ (9,321)	$ (17,639)
Loss from discontinued operations, net of income taxes		(13,065)
Loss from continuing operations	(9,321)	(4,574)
Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities:
Depreciation and amortization	15,641	13,478
Equity in earnings of joint ventures	750	(3,067)
Cash distributions from joint ventures		2,046
Deferred income taxes	(2,920)	(2,825)
Gain on sale of assets	(199)	11
Other non-cash restructuring items	2,015
Amortization of deferred financing fees	901	825
Unrealized net (gain) loss from mark-to-market valuations of derivatives		1,548
Unrealized foreign currency gain	(144)	(76)
Share-based compensation expense	1,009	918
Changes in assets and liabilities:
Accounts receivable	(21,908)	(3,234)
Contract revenues in excess of billings	32,703	19,362
Inventories	665	(609)
Prepaid expenses and other current assets	11,548	(4,929)
Accounts payable and accrued expenses	(19,077)	(27,610)
Billings in excess of contract revenues	(2,527)	3,931
Other noncurrent assets and liabilities	(4,506)	(255)
Cash provided by (used in) operating activities	4,630	(5,060)
Purchases of property and equipment	(7,549)	(17,452)
Proceeds from dispositions of property and equipment	5,015	265
Cash used in investing activities	(2,534)	(17,187)
Cash used in investing activities	(2,534)	(17,187)
FINANCING ACTIVITIES:
Deferred financing fees		(58)
Repayments of debt	(706)	(659)
Taxes paid on settlement of vested share awards	(936)	(164)
Exercise of options and purchases from employee stock plans	404	434
Borrowings under revolving loans	17,000	28,112
Repayments of revolving loans	(21,000)	(16,723)
Cash provided by (used in) financing activities	(5,238)	10,942
Effect of foreign currency exchange rates on cash and cash equivalents	26	(2)
Net decrease in cash, cash equivalents and restricted cash	(3,116)	(11,307)
Cash, cash equivalents and restricted cash at beginning of period	17,352	19,702
Cash, cash equivalents and restricted cash at end of period	14,236	8,395
Supplemental Cash Flow Information
Cash paid for interest	1,872	11,473
Cash paid for income taxes	54	89
Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	3,614	$ 2,187
Repayments of debt with proceeds from sale-leaseback transactions	$ 13,034

Basis Of Presentation

3 Months Ended

Mar. 31, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Basis Of Presentation

Basis of presentation

The unaudited condensed consolidated financial statements and notes herein should be read in conjunction with the audited consolidated financial statements of Great Lakes Dredge & Dock Corporation and Subsidiaries (the “Company” or “Great Lakes”) and the notes thereto, included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2017. The condensed consolidated financial statements included herein have been prepared by the Company without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the SEC’s rules and regulations, although management believes that the disclosures are adequate and make the information presented not misleading. In the opinion of management, all adjustments, which are of a normal and recurring nature (except as otherwise noted), that are necessary to present fairly the Company’s financial position as of March 31, 2018, and its results of operations for the three months ended March 31, 2018 and 2017 and cash flows for the three months ended March 31, 2018 and 2017 have been included.

The Company adopted Accounting Standard Update No. 2016-18 (“ASU 2016-18”), Statement of Cashflows (Topic 230): Restricted Cash on January 1, 2018. The amendments require that the statement of cash flows explain the changes during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore amounts generally described as restricted cash or restricted cash equivalents should be included with the cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The impact of the adoption of ASU 2016-18 has been applied retrospectively and the prior period presented has been recast.

The following table provides a reconciliation of cash, cash equivalents and restricted cash at March 31, 2018 and December 31, 2017 reported within the Condensed Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Condensed Consolidated Statements of Cash Flows.

	March 31, 2018		December 31, 2017
Cash and cash equivalents	$	12,736	$	15,852
Restricted cash included in other long-term assets		1,500		1,500
Cash, cash equivalents and restricted cash at end of period	$	14,236	$	17,352

Effective beginning the first quarter of 2018, the Company changed the method of accounting for allocated fixed equipment costs for interim periods such that fixed equipment costs are now recognized as incurred. The Company adopted this change as a result of management’s belief that the new method is preferable and results in a more objective measure of quarterly expense that will better support planning and resource allocation decisions by management. The change has been applied retrospectively and all prior interim periods presented have been recast. The Company’s cost structure includes significant annual equipment-related costs, including depreciation, maintenance, insurance and long-term rentals. Previously, the Company allocated fixed equipment costs to interim periods in proportion to revenues recognized over the year. Specifically, at each interim reporting date the Company compared actual revenues earned to date on its dredging contracts to expected annual revenues and recognized equipment costs on the same proportionate basis. In the fourth quarter, any over or under allocated equipment costs are recognized such that the expense for the year equals actual equipment costs incurred during the year. The quarterly impact of the change in accounting policy on our Condensed Consolidated Statements of Operations and Condensed Consolidated Balance Sheets is as follows:

	Three Months Ended
	March 31, 2017
Costs of contract revenues	$	1,370
Income tax benefit		519
Loss from continuing operations		(851	)
Net loss	$	(851	)

Comprehensive loss	$	(851	)

Basic loss per share attributable to continuing operations	$	(0.01	)
Diluted loss per share attributable to continuing operations	$	(0.01	)

	March 31, 2017
Prepaid expenses and other current assets	$	(1,370	)
Deferred income taxes		(519	)
Accumulated deficit	$	(851	)

The Company adopted Accounting Standard Update No. 2014-09, Revenue from Contracts with Customers (Topic 606), and subsequently issued other Accounting Standard Updates related to Accounting Standards Codification Topic 606 (collectively, “ASC 606”) on January 1, 2018 under the modified retrospective method such that the cumulative effect is recognized at the date of initial application. The adoption of ASC 606 may result in a change in the timing of recognition of both contract revenue and costs from our prior practices. Upon the adoption of ASC 606, the Company recorded a cumulative net adjustment of $1,950 to the beginning retained earnings balance. Refer to Note 7, Revenue, for further discussion of the adoption of ASC 606.

In February 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update No. 2018-02 (“ASU 2018-02”), Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The new guidance allows entities to reclassify from accumulated other comprehensive income to retained earnings stranded tax effects resulting from the Tax Cut and Jobs Act. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those annual periods. Early adoption is permitted in fiscal 2018. The Company has elected to early adopt ASU 2018-02 during the quarter ended March 31, 2018.

The components of costs of contract revenues include labor, equipment (including depreciation, maintenance, insurance and long-term rentals), subcontracts, fuel, supplies, short-term rentals and project overhead. Hourly labor is generally hired on a project-by-project basis. Costs of contract revenues vary significantly depending on the type and location of work performed and assets utilized.

The Company has two operating segments: dredging and environmental & infrastructure, which are also the Company’s reportable segments and reporting units of which the Company tests goodwill for impairment. The Company performed its most recent annual test of impairment as of July 1, 2017 with no indication of impairment as of the test date. The Company will perform its next scheduled annual test of goodwill in the third quarter of 2018 should no triggering events occur which would require a test prior to the next annual test.

The condensed consolidated results of operations and comprehensive income for the interim periods presented herein are not necessarily indicative of the results to be expected for the full year.

Recent accounting pronouncements

In January 2017, the FASB issued Accounting Standard Update No. 2017-04 (“ASU 2017-04”), Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The amendment removes the requirement to compare the implied fair value of goodwill with its carrying amount as part of step 2 of the goodwill impairment test. The guidance is effective for fiscal years beginning after December 15, 2019. The Company does not anticipate that the adoption of ASU 2017-04 will have a material effect on the Company’s consolidated financial statements.

In February 2016, the FASB issued Accounting Standard Update No. 2016-02 (“ASU 2016-02”), Leases (Topic 842). The FASB issued this update to increase the transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those annual periods. The Company is currently evaluating the impact of ASU 2016-02 on its consolidated financial statements.

Earnings Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Earnings per share

Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the reporting period. Diluted earnings per share is computed the same as basic earnings per share except that it reflects the potential dilution that could occur if dilutive securities or other obligations to issue common stock were exercised or converted into common stock. For the three months ended March 31, 2018 and 2017, 781 thousand and 678 thousand stock options and restricted stock units, respectively, were excluded from the diluted weighted-average common shares outstanding as the Company incurred a loss during these periods. For the three months ended March 31, 2018 and 2017, 1,906 thousand and 1,580 thousand stock options and restricted stock units, respectively, were excluded from the calculation of diluted earnings per share as such stock options and restricted stock units were determined to be anti-dilutive.

The computations for basic and diluted earnings (loss) per share are as follows:

	Three Months Ended
(shares in thousands)	March 31,
	2018			2017

Loss from continuing operations	$	(9,321	)	$	(4,574	)
Loss from discontinued operations, net of income taxes		—			(13,065	)
Net loss		(9,321	)		(17,639	)

Weighted-average common shares outstanding — basic		61,815			61,065
Effect of stock options and restricted stock units		—			—

Weighted-average common shares outstanding — diluted		61,815			61,065

Loss per share from continuing operations — basic	$	(0.15	)	$	(0.07	)
Loss per share from continuing operations — diluted	$	(0.15	)	$	(0.07	)

Accrued Expenses

3 Months Ended

Mar. 31, 2018

Payables And Accruals [Abstract]

Accrued Expenses

Accrued expenses

Accrued expenses at March 31, 2018 and December 31, 2017 are as follows:

	March 31,		December 31,
	2018		2017

Insurance	$	13,364	$	22,941
Interest		10,097		4,210
Payroll and employee benefits		6,730		8,747
Accrued rent		6,079		6,519
Percentage of completion adjustment		3,368		3,591
Income and other taxes		2,602		2,794
Other		10,044		7,416
Total accrued expenses	$	52,284	$	56,218

Long-term Debt

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Long-Term Debt

Long-term debt

Credit agreement

On December 30, 2016, the Company, Great Lakes Dredge & Dock Company, LLC, NASDI Holdings, LLC, Great Lakes Dredge & Dock Environmental, Inc., Great Lakes Environmental & Infrastructure Solutions, LLC and Great Lakes Environmental & Infrastructure, LLC (collectively, the “Credit Parties”) entered into a revolving credit and security agreement, as subsequently amended, (the “Credit Agreement”) with certain financial institutions from time to time party thereto as lenders, PNC Bank, National Association, as Agent, PNC Capital Markets, The PrivateBank and Trust Company, Suntrust Robinson Humphrey, Inc., Capital One, National Association and Bank of America, N.A., as Joint Lead Arrangers and Joint Bookrunners, Texas Capital Bank, National Association, as Syndication Agent and Woodforest National Bank, as Documentation Agent. The Credit Agreement, which replaced the Company’s former revolving credit agreement, provides for a senior secured revolving credit facility in an aggregate principal amount of up to $250,000, subfacilities for the issuance of standby letters of credit up to a $250,000 sublimit and swingline loans up to a $25,000 sublimit. The maximum borrowing capacity under the Credit Agreement is determined by a formula and may fluctuate depending on the value of the collateral included in such formula at the time of determination. The Credit Agreement also includes an increase option that will allow the Company to increase the senior secured revolving credit facility by an aggregate principal amount of up to $100,000. This increase is subject to lenders providing incremental commitments for such increase, the Credit Parties having adequate borrowing capacity and that no default or event of default exists both before and after giving effect to such incremental commitment increase.

The Credit Agreement also provides for certain actions contemplated in the plan of restructuring with respect to the Company’s 2017 and 2018 fiscal years including allowing up to an aggregate of $20,000 of expenses related to the buy-out of operating leases and allowing capital expenditures planned but not incurred by all Credit Parties in fiscal year 2017 to be carried forward to fiscal year 2018; provided further that, the aggregate amount of all capital expenditures incurred by all Credit Parties in fiscal years 2017 and 2018 does not exceed $135,000. Additionally, the Credit Agreement contains acknowledgments and agreements from the Agent and the required lenders with respect to certain EBITDA add-backs for fiscal years 2017 and 2018 described therein. See Note 8, Restructuring charges.

The Credit Agreement contains customary representations and affirmative and negative covenants, including a springing financial covenant that requires the Credit Parties to maintain a fixed charge coverage ratio (ratio of earnings before income taxes, depreciation and amortization, net interest expenses, non-cash charges and losses and certain other non-recurring charges, minus capital expenditures, income and franchise taxes, to net cash interest expense plus scheduled cash principal payments with respect to debt plus restricted payments paid in cash) of not more than 1.10 to 1.00. The Company is required to maintain this ratio if its availability under the Credit Agreement falls below $31,250 for five consecutive days or $25,000 for one day. The Credit Parties are also restricted in the amount of capital expenditures they may make in each fiscal year. The Credit Agreement also contains customary events of default (including non-payment of principal or interest on any material debt and breaches of covenants) as well as events of default relating to certain actions by the Company’s surety bonding providers. The obligations of the Credit Parties under the Credit Agreement will be unconditionally guaranteed, on a joint and several basis, by each existing and subsequently acquired or formed material direct and indirect domestic subsidiary of the Company. Borrowings under the Credit Agreement were or will be used to refinance existing indebtedness under the Company’s former revolving credit agreement, refinance existing indebtedness under the Company’s former term loan agreement, pay fees and expenses related to the Credit Agreement, finance acquisitions permitted under the Credit Agreement, finance ongoing working capital and for other general corporate purposes. The Credit Agreement matures on December 30, 2019.

The obligations under the Credit Agreement are secured by substantially all of the assets of the Credit Parties. The outstanding obligations thereunder shall be secured by a valid first priority perfected lien on substantially all of the vessels of the Credit Parties and a valid perfected lien on all domestic accounts receivable and substantially all other assets of the Credit Parties, subject to the permitted liens and interests of other parties (including the Company’s surety bonding provider).

Interest on the senior secured revolving credit facility of the Credit Agreement is equal to either a base rate option or LIBOR option, at the Company’s election. The base rate option is (1) the base commercial lending rate of PNC Bank, National Association, as publicly announced plus (2)(a) an interest margin of 2.0% or (b) after the date on which a borrowing base certificate is required to be delivered under Section 9.2 of the Credit Agreement (commencing with the fiscal quarter ending December 31, 2017, the “Adjustment Date”), an interest margin ranging between 1.5% and 2.0% depending on the quarterly average undrawn availability on the senior secured revolving credit facility. The LIBOR option is the sum of (1) LIBOR and (2)(a) an interest margin of 3.0% or (b) after the Adjustment Date, an interest rate margin ranging between 2.5% to 3.0% per annum depending on the quarterly average undrawn availability on the senior secured revolving credit facility. The Credit Agreement is subject to an unused fee ranging from 0.25% to 0.375% per annum depending on the amount of average daily outstandings under the senior secured revolving credit facility.

As of March 31, 2018, the Company had $91,000 of borrowings on the revolver, $31,215 of letters of credit outstanding and $77,070 of availability under the Credit Agreement. The availability under the Credit Agreement is suppressed by $50,715 as of March 31, 2018 as a result of certain additional limitations set forth in the Credit Agreement.

Senior Notes and subsidiary guarantors

In May 2017, the Company issued $325,000 of 8.000% senior notes (“8% Senior Notes”) due May 15, 2022. The 8% Senior Notes were issued at 100% of face value resulting in net proceeds of $321,653, net of underwriting fees. In connection with the issuance of the 8% Senior Notes, the Company retired all of its $275,000 of 7.375% senior notes due February 2019 for $282,638, which included a tender premium and accrued and unpaid interest. The Company used the remaining net proceeds from the debt offering to reduce the Company’s indebtedness under its Credit Agreement.

The Company’s obligations under these Senior Notes are guaranteed by certain of the Company’s 100% owned domestic subsidiaries. Such guarantees are full, unconditional and joint and several. The parent company issuer has no independent assets or operations and all non-guarantor subsidiaries have been determined to be minor.

Other

The Company enters into note arrangements to finance certain vessels and ancillary equipment. The current portion of all equipment notes is $1,379. The long term portion is $531 and is included in notes payable or other long term liabilities. In February 2018, the Company completed a sale-leaseback of a vessel yielding net proceeds of $4,500. Included in this transaction was the retirement of the asset and related equipment note, and the transaction resulted in a deferred gain that will be amortized over the life of the lease.

Fair Value Measurements

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair value measurements

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. A fair value hierarchy has been established by GAAP that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The accounting guidance describes three levels of inputs that may be used to measure fair value:

Level 1—Quoted prices in active markets for identical assets or liabilities.

Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The Company utilizes the market approach to measure fair value for its financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. At times, the Company holds certain derivative contracts that it uses to manage foreign currency risk or commodity price risk. The Company does not hold or issue derivatives for speculative or trading purposes. The fair values of these financial instruments are summarized as follows:

			Fair Value Measurements at Reporting Date Using
Description	At March 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	1,507	$	—		1,507	$	—

			Fair Value Measurements at Reporting Date Using
Description	At December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	2,501	$	—	$	2,501	$	—

Fuel hedge contracts

The Company is exposed to certain market risks, primarily commodity price risk as it relates to diesel fuel purchase requirements, which occur in the normal course of business. The Company enters into heating oil commodity swap contracts to hedge the risk that fluctuations in diesel fuel prices could have an adverse impact on cash flows associated with its domestic dredging contracts. The Company’s goal is to hedge approximately 80% of the fuel requirements for work in domestic backlog.

As of March 31, 2018, the Company was party to various swap arrangements to hedge the price of a portion of its diesel fuel purchase requirements for work in its backlog to be performed through January 2019. As of March 31, 2018, there were 6.4 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted domestic fuel purchases through January 2019. Under these swap agreements, the Company will pay fixed prices ranging from $1.53 to $2.02 per gallon.

At March 31, 2018 and December 31, 2017, the fair value assets of the fuel hedge contracts were estimated to be $1,507 and $2,501, respectively, and are recorded in prepaid expenses and other current assets. For fuel hedge contracts considered to be highly effective, the gains reclassified to earnings from changes in fair value of derivatives, net of cash settlements and taxes, for the three months ended March 31, 2018 were $732. The remaining gains and losses included in accumulated other comprehensive loss at March 31, 2018 will be reclassified into earnings over the next ten months, corresponding to the period during which the hedged fuel is expected to be utilized. Changes in the fair value of fuel hedge contracts not considered highly effective are recorded as cost of contract revenues in the Statement of Operations. The fair values of fuel hedges are corroborated using inputs that are readily observable in public markets; therefore, the Company determines fair value of these fuel hedges using Level 2 inputs.

The Company is exposed to counterparty credit risk associated with non-performance of its various derivative instruments. The Company’s risk would be limited to any unrealized gains on current positions. To help mitigate this risk, the Company transacts only with counterparties that are rated as investment grade or higher. In addition, all counterparties are monitored on a continuous basis.

The fair value of the fuel hedge contracts outstanding as of March 31, 2018 and December 31, 2017 is as follows:

		Fair Value at
		March 31,		December 31,
	Balance Sheet Location	2018		2017
Asset derivatives:
Derivatives designated as hedging instruments
Fuel hedge contracts	Prepaid expenses and other current assets	$	1,507	$	2,501

Accumulated other comprehensive income

Changes in the components of the accumulated balances of other comprehensive income (loss) are as follows:

	Three Months Ended
	March 31,
	2018			2017
Cumulative translation adjustments—net of tax	$	1,361		$	(28	)
Derivatives:
Reclassification of derivative (gains) losses to earnings—net of tax		(732	)		40
Change in fair value of derivatives—net of tax		(2	)		(774	)
Net unrealized gain on derivatives—net of tax		(734	)		(734	)
Total other comprehensive income (loss)	$	627		$	(762	)

Adjustments reclassified from accumulated balances of other comprehensive income (loss) to earnings are as follows:

		Three Months Ended
		March 31,
	Statement of Operations Location	2018			2017
Derivatives:
Fuel hedge contracts	Costs of contract revenues	$	(992	)	$	66
	Income tax benefit		260			26
		$	(732	)	$	40

During the three months ended March 31, 2018, the Company substantially completed the closeout of its Brazil operations. This liquidation resulted in the reversal of the Company’s cumulative translation adjustment of $2,015 related to Brazil which is included in other income (expense) in the Condensed Consolidated Statements of Operations.

Other financial instruments

The carrying value of financial instruments included in current assets and current liabilities approximates fair value due to the short-term maturities of these instruments. Based on timing of the cash flows and comparison to current market interest rates, the carrying value of our revolving credit agreement approximates fair value. In May 2017, the Company issued a total of $325,000 of 8% senior notes due May 15, 2022, which were outstanding at March 31, 2018 (see Note 4, Long-term debt). The 8% Senior Notes are senior unsecured obligations of the Company and its subsidiaries that guarantee the 8% Senior Notes. The fair value of the senior notes was $333,125 at March 31, 2018, which is a Level 1 fair value measurement as the senior notes’ value was obtained using quoted prices in active markets. It is impracticable to determine the fair value of outstanding letters of credit or performance, bid and payment bonds due to uncertainties as to the amount and timing of future obligations, if any.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Share-Based Compensation

3 Months Ended

Mar. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-Based Compensation

Share-based compensation

On May 11, 2017, the Company’s stockholders approved the Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan (the “Incentive Plan”), which previously had been approved by the Company’s board of directors subject to stockholder approval. The Incentive Plan permits the granting of stock options, stock appreciation rights, restricted stock and restricted stock units to the Company’s employees and directors for up to 3.3 million shares of common stock, plus an additional 1.7 million shares underlying equity awards issued under the 2007 Long-Term Incentive Plan.

During the three months ended March 31, 2018, the Company granted 1,985 thousand restricted stock units to certain employees. In addition, all non-employee directors on the Company’s board of directors are paid a portion of their board-related compensation in stock grants or restricted stock units. Compensation cost charged to expense related to share-based compensation arrangements was $1,009 and $918 for the three months ended March 31, 2018 and 2017, respectively.

Revenue

3 Months Ended

Mar. 31, 2018

Revenue From Contract With Customer [Abstract]

Revenue

The Company’s revenue is derived from contracts for services with federal, state, local and foreign governmental entities and private customers. Dredging revenues are generally derived from the enhancement or preservation of navigability of waterways or the protection of shorelines through the removal or replenishment of soil, sand or rock. Revenues within the environmental & infrastructure segment are generally generated from environmental and geotechnical construction as well as soil, water and sediment environmental remediation.

Previously, the Company measured completion based on engineering estimates of the physical percentage completed for dredging contracts and based upon cost incurred to date compared to total estimated costs, also known as cost-to-cost, for environmental & infrastructure contracts. Under the new accounting principle, the Company measures progress toward completion on all contracts utilizing the cost-to-cost method. Additionally, the Company capitalizes certain pre-contract and pre-construction costs, and defers recognition over the life of the contract. At March 31, 2018, the impact of this change in accounting principle on the Consolidated Balance Sheets is as follows:

	March 31, 2018
ASSETS
Contract revenues in excess of billings	$	(6,703	)
Other current assets		2,044
Other		5,012
LIABILITIES AND EQUITY
Accrued expenses		361
Billings in excess of contract revenues		1,958
Deferred taxes		(511	)

Accumulated deficit	$	(1,455	)

For the three months ended March 31, 2018, the impact of this change in accounting principle on the Consolidated Statements of Operations is as follows:

	Three Months Ended
	March 31,
	2018

Contract revenues	$	(8,661	)
Cost of contract revenues		(6,695	)
Income tax benefit		511
Loss from continuing operations		(1,455	)
Net loss	$	(1,455	)

Comprehensive loss	$	(1,455	)

Performance obligations

A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account upon which the Company’s revenue is calculated. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue as the performance obligation is satisfied. Fixed-price contracts, which comprise substantially all of the Company’s revenue, will most often represent a single performance obligation as the promise to transfer the individual services is not separately identifiable from other promises in the contracts and, therefore, not distinct.

The Company capitalizes certain pre-contract and pre-construction costs, and defers recognition over the life of the contract. The Company’s performance obligations are satisfied over time and revenue is recognized using contract fulfillment costs incurred to date compared to total estimated costs at completion, also known as cost-to-cost, to measure progress towards completion. As the Company’s performance creates an asset that customer controls, this method provides a faithful depiction of the transfer of an asset to the customer. Generally, the Company has an enforceable right to payment for performance completed to date.

The dredging and environmental & infrastructure segments typically satisfy their performance obligations upon completion of service. The majority of the Company’s contracts are completed in a year or less. At March 31, 2018, the Company had $512,999 of remaining performance obligations, which the Company refers to as total backlog. Approximately 87% of the Company’s backlog will be completed in 2018 with the remaining balance expected to be completed by 2020.

Transaction price

The transaction price is calculated using the Company’s estimated costs to complete a project. These costs are based on the types of equipment required to perform the specified service, project site conditions, the estimated project duration, seasonality, location and complexity of a project.

The nature of the Company’s contracts gives rise to several types of variable consideration, including pay on quantity dredged for dredging projects and contract modifications for both dredging and environmental & infrastructure projects. For dredging projects, estimated pay quantity is the amount of material the Company expects to dredge for which it will receive payment. Estimated quantity to be dredged is calculated using engineering estimates based on current survey data and the Company’s knowledge based on historical project experience. Contract modifications are changes in the scope or price (or both) of a contract that are approved by the parties to the contract. The Company recognizes a contract modification when the parties to a contract approve a modification that either creates new, or changes existing, enforceable rights and obligations of the parties to the contract. Contract modifications are included in the transaction price only if it is probable that the modification estimate will not result in a significant reversal of revenue. Contract modifications are routine in the performance of the Company’s contracts. In most instances, contract modifications are for services that are not distinct, and, therefore, are accounted for as part of the existing contract.

Revisions in estimated gross profit percentages are recorded in the period during which the change in circumstances is experienced or becomes known. As the duration of most of the Company’s contracts is one year or less, the cumulative net impact of these revisions in estimates, individually and in the aggregate across our projects, does not significantly affect our results across annual reporting periods. Provisions for estimated losses on contracts in progress are made in the period in which such losses are determined.

Revenue by category

The following series of tables presents our revenue disaggregated by several categories.

Domestically, our work generally is performed in coastal waterways and deep water ports. The U.S. dredging market consists of four primary types of work: capital, coastal protection, maintenance and rivers & lakes. Foreign projects typically involve capital work.

The following table sets forth, by segment and type of work, the Company’s contract revenues for the periods ended:

	Three Months Ended
	March 31,
Revenues (in thousands)	2018		2017
Dredging:
Capital—U.S.	$	76,952	$	66,601
Capital—foreign		5,523		19,154
Coastal protection		41,861		40,335
Maintenance		7,803		21,913
Rivers & lakes		1,484		5,051
Total dredging revenues		133,623		153,054
Environmental & infrastructure		12,970		19,224
Intersegment revenue		—		(1,692	)
Total revenues	$	146,593	$	170,586

The following table sets forth, by segment and type of customer, the Company’s contract revenues for the periods ended:

	Three Months Ended
	March 31,
Revenues (in thousands)	2018		2017
Dredging:
Federal government	$	76,694	$	111,494
State and local government		46,625		15,645
Private		4,781		6,761
Foreign		5,523		19,154
Total dredging revenues		133,623		153,054
Environmental & infrastructure:
Private		6,364		10,535
Other		6,606		8,689
Intersegment revenue		—		(1,692	)
Total revenues	$	146,593	$	170,586

Foreign dredging revenue for the three months ended March 31, 2018 and 2017 was $5,523 and $19,154, respectively, and was mostly attributable to work done in the Middle East.

Contract balances

Billings on contracts are generally submitted after verification with the customers of physical progress and are recognized as accounts receivable in the balance sheet. For billings that do not match the timing of revenue recognition, the difference between amounts billed and recognized as revenue is reflected in the balance sheet as either contract revenues in excess of billings or billings in excess of contract revenues. Certain pre-contract and pre-construction costs are capitalized and reflected as contract assets in the balance sheet. Customer advances, deposits and commissions are reflected in the balance sheet as contract liabilities.

Accounts receivable at March 31, 2018 and December 31, 2017 are as follows:

	March 31,			December 31,
	2018			2017
Completed contracts	$	27,277		$	15,974
Contracts in progress		51,541			42,759
Retainage		23,650			21,866
		102,468			80,599
Allowance for doubtful accounts		(552	)		(591	)

Total accounts receivable—net	$	101,916		$	80,008

Current portion of accounts receivable—net	$	97,441		$	75,533
Long-term accounts receivable and retainage		4,475			4,475
Total accounts receivable—net	$	101,916		$	80,008

The components of contracts in progress at March 31, 2018 and December 31, 2017 are as follows:

	March 31,			December 31,
	2018			2017
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	492,739		$	558,557
Amounts billed		(461,677	)		(490,732	)
Costs and earnings in excess of billings for contracts in progress		31,062			67,825
Costs and earnings in excess of billings for completed contracts		24,060			22,963
Total contract revenues in excess of billings	$	55,122		$	90,788

Billings in excess of costs and earnings:
Amounts billed	$	(246,565	)	$	(325,350	)
Costs and earnings for contracts in progress		237,793			321,735
Total billings in excess of contract revenues	$	(8,772	)	$	(3,615	)

The Company has $17,860 included in costs in excess of billings that are dependent upon the sale of environmental credits earned for a wetland mitigation project. The sale of these credits is subject to market factors that could cause the amount of expected revenue to be higher or lower than currently estimated. If the amount of proceeds received from the sale of the environmental credits is lower than our expectations, we could sustain a loss of part or all of costs incurred related to this project. Additionally, the timing of realization may be impacted by the timing of a delay in the sale of these environmental credits, requiring a longer period required to recover our investment.

Revenue recognized for the three months ended March 31, 2018, that was included in the billings in excess of contract revenues balance at the beginning of the year was $2,812.

At March 31, 2018 and January 1, 2018, costs to fulfill a contract with a customer recognized as an asset were $14,789 and $7,732, respectively, and are recorded in other current assets and other noncurrent assets. These costs relate to pre-contract and pre-construction activities. During the three months ended March 31, 2018, the company amortized $2,497 of pre-construction costs.

Restructuring Charges

3 Months Ended

Mar. 31, 2018

Restructuring And Related Activities [Abstract]

Restructuring Charges

Restructuring charges

In 2017, a strategic review was begun to improve the Company’s financial results in both domestic and international operations enabling debt reduction, improvements in return on capital and the continued renewal of our extensive fleet with new and efficient dredges to best serve our domestic and international clients. As a result of this review, management began execution of a plan to reduce general and administrative and overhead expenses, retire certain underperforming and underutilized assets, write-off pre-contract costs on a project that was never formally awarded and that the Company no longer intends to pursue and closeout the Company’s Brazil operations. These changes will result in a restructuring charge of approximately $42,000-$47,000, including severance of approximately $3,000, asset retirements of approximately $30,000-$34,000, pre-contract costs of approximately $6,500 and closeout costs of approximately $2,500-$3,500.

Approximately $38,000-$43,000 of this charge will be non-cash and includes depreciation, loss on sale of assets and other items, approximating totals of $12,500-$14,500, $3,000-$5,000 and $21,500-$23,500, respectively. The majority of the charge was recorded in the second half of 2017 with the remainder to be recognized in the dredging segment in 2018.

Restructuring charges currently recognized for the above actions are summarized as follows:

	Three Months Ended
	March 31, 2018

Costs of contract revenues - depreciation	$	2,992
Costs of contract revenues - other		1,267
General and administrative expenses		7
Gain on sale of assets—net		(7	)
Other income (expense)		2,015
Total Dredging		6,274

General and administrative expenses		168
Total Environmental & Infrastructure		168

Costs of contract revenues - depreciation		2,992
Costs of contract revenues - other		1,267
General and administrative expenses		175
Gain on sale of assets—net		(7	)
Other income (expense)		2,015
Total Consolidated		6,442

The Company accrued rent expense of $5,348 and $5,930 and severance expense of $1,248 and $1,567 at March 31, 2018 and December 31, 2017, respectively. Both of these items are included in accrued expenses at March 31, 2018 and December 31, 2017 and are expected to be settled in 2018.

Commitments And Contingencies

3 Months Ended

Mar. 31, 2018

Commitments And Contingencies Disclosure [Abstract]

Commitments And Contingencies

Commitments and contingencies

Commercial commitments

Performance and bid bonds are customarily required for dredging and marine construction projects, as well as some environmental & infrastructure projects. The Company has bonding agreements with Argonaut Insurance Company, Berkley Insurance Company, Chubb Surety and Liberty Mutual Insurance Company, under which the Company can obtain performance, bid and payment bonds. The Company also has outstanding bonds with Travelers Casualty, Surety Company of America and Zurich American Insurance Company (“Zurich”). Bid bonds are generally obtained for a percentage of bid value and amounts outstanding typically range from $1,000 to $10,000. At March 31, 2018, the Company had outstanding performance bonds with a notional amount of approximately $1,211,568 of which $41,085 relates to projects from the Company’s historical environmental & infrastructure businesses. The revenue value remaining in backlog related to these projects totaled approximately $474,902.

In connection with the sale of our historical demolition business, the Company was obligated to keep in place the surety bonds on pending demolition projects for the period required under the respective contract for a project and issued Zurich a letter of credit related to this exposure. In February 2017, the Company was notified by Zurich of an alleged default triggered on a historical demolition surety performance bond in the aggregate of approximately $20,000 for failure of the contractor to perform in accordance with the terms of a project. In May 2017, Zurich drew upon the letter of credit in the amount of $20,881. In order to fund the draw on the letter of credit, the Company had to increase the borrowings on its revolving credit facility. As the outstanding letters of credit previously reduced our availability under the revolving credit facility, this draw down on our letter of credit does not impact our liquidity or capital availability.

Pursuant to the terms of sale of our historical demolition business, the Company received an indemnification from the buyer for losses resulting from the bonding arrangement. The Company intends to aggressively pursue enforcement of the indemnification provisions if the buyer of the historical demolition business is found to be in default of its obligations. The Company cannot estimate the amount or range of recoveries related to the indemnification or resolution of the Company’s responsibilities under the surety bond. The surety bond claim impact has been included in discontinued operations and is discussed in Note 11, Business dispositions.

Certain foreign projects performed by the Company have warranty periods, typically spanning no more than one to three years beyond project completion, whereby the Company retains responsibility to maintain the project site to certain specifications during the warranty period. Generally, any potential liability of the Company is mitigated by insurance, shared responsibilities with consortium partners, and/or recourse to owner-provided specifications.

Legal proceedings and other contingencies

As is customary with negotiated contracts and modifications or claims to competitively bid contracts with the federal government, the government has the right to audit the books and records of the Company to ensure compliance with such contracts, modifications, or claims, and the applicable federal laws. The government has the ability to seek a price adjustment based on the results of such audit. Any such audits have not had, and are not expected to have, a material impact on the financial position, operations, or cash flows of the Company.

Various legal actions, claims, assessments and other contingencies arising in the ordinary course of business are pending against the Company and certain of its subsidiaries. These matters are subject to many uncertainties, and it is possible that some of these matters could ultimately be decided, resolved, or settled adversely to the Company. Although the Company is subject to various claims and legal actions that arise in the ordinary course of business, except as described below, the Company is not currently a party to any material legal proceedings or environmental claims. The Company records an accrual when it is probable a liability has been incurred and the amount of loss can be reasonably estimated. The Company does not believe any of these proceedings, individually or in the aggregate, would be expected to have a material effect on results of operations, cash flows or financial condition.

On April 23, 2014, the Company completed the sale of NASDI, LLC (“NASDI”) and Yankee Environmental Services, LLC (“Yankee”), which together comprised the Company’s historical demolition business, to a privately owned demolition company. Legal actions brought by the Company to enforce the buyer’s obligations under the sale agreement are described below.

On January 14, 2015, the Company and our subsidiary, NASDI Holdings, LLC, brought an action in the Delaware Court of Chancery to enforce the terms of the Company’s agreement to sell NASDI and Yankee. Under the terms of the agreement, the Company received cash of $5,309 and retained the right to receive additional proceeds based upon future collections of outstanding accounts receivable and work in process existing at the date of close. The Company seeks specific performance of the buyer’s obligation to collect and to remit the additional proceeds, and other related relief. Defendants have filed counterclaims alleging that the Company misrepresented the quality of its contracts and receivables prior to the sale. The Company denies defendants’ allegations and intends to vigorously defend against the counterclaims.

Also pursuant to the terms of the agreement to sell NASDI and Yankee and as described above, the Company agreed to keep in place surety bonds for certain pending demolition projects, and the buyer agreed to indemnify the Company for all losses relating to those bonds. As described above, in May 2017, Zurich drew upon the Company’s letter of credit in the amount of $20,881. On May 26, 2017, the Company and NASDI Holdings, LLC brought a second action in the Delaware Court of Chancery seeking indemnification for all losses relating to the bonds for that project.

Except as noted above, the Company has not accrued any amounts with respect to the above matters, as the Company does not believe, based on information currently known to it, that a loss relating to these matters is probable, and an estimate of a range of potential losses relating to these matters cannot reasonably be made.

Investments

3 Months Ended

Mar. 31, 2018

Equity Method Investments And Joint Ventures [Abstract]

Investments

10.

Investments

The Company owned 50% of TerraSea Environmental Solutions (“TerraSea”) as a joint venture. TerraSea was engaged in the environmental services business through its ability to remediate contaminated soil and dredged sediment treatment. TerraSea was dissolved in the third quarter of 2017.

Business Combinations And Dispositions

3 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Business Combinations And Dispositions

11.

Business combinations and dispositions

Discontinued operations

On April 23, 2014, the Company entered into an agreement and completed the sale of NASDI and Yankee, its two former subsidiaries that comprised our historical demolition business. Under the terms of the agreement, the Company received cash of $5,309 and retained the right to receive additional proceeds based upon future collections of outstanding accounts receivable and work in process existing at the date of close, including recovery of outstanding claims for additional compensation from customers, net of future payments of accounts payable existing at the date of close, including any future payments of obligations associated with outstanding claims. The amount and timing of any realization of additional net proceeds has been impacted by the litigation with the buyer of the historical demolition business. However, management believes that the ultimate resolution of these matters will not be material to the Company’s consolidated financial position or results of operations.

As discussed in Note 9, Commitments and contingencies, the Company was notified by Zurich of an alleged default triggered on a historical demolition surety performance bond in the aggregate of approximately $20,000 for failure of the contractor to perform in accordance with the terms of a project. Zurich could be obligated to reimburse the loss, damage and expense that may arise from the alleged default. The Company estimated its exposure to a surety bond claim, including associated expenses, to be $20,900 and has recorded this amount in discontinued operations during the three months ended March 31, 2017 as follows:

	Three Months Ended
	March 31,
	2017

Revenue	$	—

Loss before income taxes from discontinued operations	$	(20,900	)
Income tax benefit		7,835
Loss from discontinued operations, net of income taxes	$	(13,065	)

Magnus Pacific acquisition

On November 4, 2014, the Company acquired Magnus Pacific Corporation (“Magnus”), a California corporation, for an aggregate purchase price of approximately $40 million. Under the terms of the acquisition, the aggregate purchase price is satisfied by payment of $25 million paid at closing, the issuance of a promissory note and an earnout payment.

Magnus did not reach the minimum EBITDA threshold for 2015 designated in the secured promissory note; therefore, during 2015, the Company reduced the remaining fair value to zero. Under the terms of the acquisition, as amended, the maximum potential aggregate earnout (the “Earnout Payment”) is $11,400 and will be determined based on the attainment of an average Adjusted EBITDA target of Magnus, now referred to as Great Lakes E&I, for the years ending December 31, 2017, December 31, 2018 and December 31, 2019. The Earnout Payment may be paid in cash or shares of the Company’s common stock, at the Company’s option. The Company remeasures the fair value of the contingent Earnout Payment based on projections of the earnings target for the business. Based on the Company’s current projections, Great Lakes E&I is not expected to reach the minimum Adjusted EBITDA threshold designated in the amended share purchase agreement.

Segment Information

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

12.

Segment information

The Company and its subsidiaries currently operate in two reportable segments: dredging and environmental & infrastructure. The Company’s financial reporting systems present various data for management to run the business, including profit and loss statements prepared according to the segments presented. Management uses operating income to evaluate performance between the two segments. Segment information for the periods presented is provided as follows:

	Three Months Ended
	March 31,
	2018			2017
Dredging
Contract revenues	$	133,623		$	153,054
Operating income		2,178			736

Environmental & infrastructure
Contract revenues	$	12,970		$	19,224
Operating loss		(3,218	)		(2,730	)

Intersegment revenues	$	—		$	(1,692	)
Total
Contract revenues	$	146,593		$	170,586
Operating loss		(1,040	)		(1,994	)

Basis Of Presentation (Policies)	3 Months Ended
Basis Of Presentation (Policies)	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Recent Accounting Pronouncements	Recent accounting pronouncements In January 2017, the FASB issued Accounting Standard Update No. 2017-04 (“ASU 2017-04”), Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The amendment removes the requirement to compare the implied fair value of goodwill with its carrying amount as part of step 2 of the goodwill impairment test. The guidance is effective for fiscal years beginning after December 15, 2019. The Company does not anticipate that the adoption of ASU 2017-04 will have a material effect on the Company’s consolidated financial statements. In February 2016, the FASB issued Accounting Standard Update No. 2016-02 (“ASU 2016-02”), Leases (Topic 842). The FASB issued this update to increase the transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those annual periods. The Company is currently evaluating the impact of ASU 2016-02 on its consolidated financial statements.

Basis Of Presentation (Tables)

3 Months Ended

Mar. 31, 2018

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash

	March 31, 2018		December 31, 2017
Cash and cash equivalents	$	12,736	$	15,852
Restricted cash included in other long-term assets		1,500		1,500
Cash, cash equivalents and restricted cash at end of period	$	14,236	$	17,352

Schedule of Quarterly Impact of Change in Accounting Policy on Condensed Consolidated Statements of Operations and Condensed Consolidated Balance Sheets

The quarterly impact of the change in accounting policy on our Condensed Consolidated Statements of Operations and Condensed Consolidated Balance Sheets is as follows:

	Three Months Ended
	March 31, 2017
Costs of contract revenues	$	1,370
Income tax benefit		519
Loss from continuing operations		(851	)
Net loss	$	(851	)

Comprehensive loss	$	(851	)

Basic loss per share attributable to continuing operations	$	(0.01	)
Diluted loss per share attributable to continuing operations	$	(0.01	)

	March 31, 2017
Prepaid expenses and other current assets	$	(1,370	)
Deferred income taxes		(519	)
Accumulated deficit	$	(851	)

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Computations For Basic And Diluted Earnings (Loss) Per Share

The computations for basic and diluted earnings (loss) per share are as follows:

	Three Months Ended
(shares in thousands)	March 31,
	2018			2017

Loss from continuing operations	$	(9,321	)	$	(4,574	)
Loss from discontinued operations, net of income taxes		—			(13,065	)
Net loss		(9,321	)		(17,639	)

Weighted-average common shares outstanding — basic		61,815			61,065
Effect of stock options and restricted stock units		—			—

Weighted-average common shares outstanding — diluted		61,815			61,065

Loss per share from continuing operations — basic	$	(0.15	)	$	(0.07	)
Loss per share from continuing operations — diluted	$	(0.15	)	$	(0.07	)

Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2018

Payables And Accruals [Abstract]

Accrued Expenses

Accrued expenses at March 31, 2018 and December 31, 2017 are as follows:

	March 31,		December 31,
	2018		2017

Insurance	$	13,364	$	22,941
Interest		10,097		4,210
Payroll and employee benefits		6,730		8,747
Accrued rent		6,079		6,519
Percentage of completion adjustment		3,368		3,591
Income and other taxes		2,602		2,794
Other		10,044		7,416
Total accrued expenses	$	52,284	$	56,218

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Schedule Of Fair Values Of Financial Instruments And Nonfinancial Assets And Liabilities Measured At The Reporting Date

The fair values of these financial instruments are summarized as follows:

			Fair Value Measurements at Reporting Date Using
Description	At March 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	1,507	$	—		1,507	$	—

			Fair Value Measurements at Reporting Date Using
Description	At December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	2,501	$	—	$	2,501	$	—

Schedule Of Fair Value Of Fuel Hedge Contracts Balance Sheet Location

The fair value of the fuel hedge contracts outstanding as of March 31, 2018 and December 31, 2017 is as follows:

		Fair Value at
		March 31,		December 31,
	Balance Sheet Location	2018		2017
Asset derivatives:
Derivatives designated as hedging instruments
Fuel hedge contracts	Prepaid expenses and other current assets	$	1,507	$	2,501

Changes In Components Of Accumulated Other Comprehensive Income (Loss)

Changes in the components of the accumulated balances of other comprehensive income (loss) are as follows:

	Three Months Ended
	March 31,
	2018			2017
Cumulative translation adjustments—net of tax	$	1,361		$	(28	)
Derivatives:
Reclassification of derivative (gains) losses to earnings—net of tax		(732	)		40
Change in fair value of derivatives—net of tax		(2	)		(774	)
Net unrealized gain on derivatives—net of tax		(734	)		(734	)
Total other comprehensive income (loss)	$	627		$	(762	)

Adjustments Reclassified From Accumulated Balances Other Comprehensive Income (Loss) To Earnings

Adjustments reclassified from accumulated balances of other comprehensive income (loss) to earnings are as follows:

		Three Months Ended
		March 31,
	Statement of Operations Location	2018			2017
Derivatives:
Fuel hedge contracts	Costs of contract revenues	$	(992	)	$	66
	Income tax benefit		260			26
		$	(732	)	$	40

Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue Recognition [Line Items]

Summary of Segment and Type of Work and Customer, Contract Revenues

The following table sets forth, by segment and type of work, the Company’s contract revenues for the periods ended:

	Three Months Ended
	March 31,
Revenues (in thousands)	2018		2017
Dredging:
Capital—U.S.	$	76,952	$	66,601
Capital—foreign		5,523		19,154
Coastal protection		41,861		40,335
Maintenance		7,803		21,913
Rivers & lakes		1,484		5,051
Total dredging revenues		133,623		153,054
Environmental & infrastructure		12,970		19,224
Intersegment revenue		—		(1,692	)
Total revenues	$	146,593	$	170,586

The following table sets forth, by segment and type of customer, the Company’s contract revenues for the periods ended:

	Three Months Ended
	March 31,
Revenues (in thousands)	2018		2017
Dredging:
Federal government	$	76,694	$	111,494
State and local government		46,625		15,645
Private		4,781		6,761
Foreign		5,523		19,154
Total dredging revenues		133,623		153,054
Environmental & infrastructure:
Private		6,364		10,535
Other		6,606		8,689
Intersegment revenue		—		(1,692	)
Total revenues	$	146,593	$	170,586

Schedule of Accounts Receivable

Accounts receivable at March 31, 2018 and December 31, 2017 are as follows:

	March 31,			December 31,
	2018			2017
Completed contracts	$	27,277		$	15,974
Contracts in progress		51,541			42,759
Retainage		23,650			21,866
		102,468			80,599
Allowance for doubtful accounts		(552	)		(591	)

Total accounts receivable—net	$	101,916		$	80,008

Current portion of accounts receivable—net	$	97,441		$	75,533
Long-term accounts receivable and retainage		4,475			4,475
Total accounts receivable—net	$	101,916		$	80,008

Components of Contracts in Progress

The components of contracts in progress at March 31, 2018 and December 31, 2017 are as follows:

	March 31,			December 31,
	2018			2017
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	492,739		$	558,557
Amounts billed		(461,677	)		(490,732	)
Costs and earnings in excess of billings for contracts in progress		31,062			67,825
Costs and earnings in excess of billings for completed contracts		24,060			22,963
Total contract revenues in excess of billings	$	55,122		$	90,788

Billings in excess of costs and earnings:
Amounts billed	$	(246,565	)	$	(325,350	)
Costs and earnings for contracts in progress		237,793			321,735
Total billings in excess of contract revenues	$	(8,772	)	$	(3,615	)

ASU 2014-09 [Member]

Revenue Recognition [Line Items]

Summary of Impact of Change in Accounting Principle on Consolidated Balance Sheets

At March 31, 2018, the impact of this change in accounting principle on the Consolidated Balance Sheets is as follows:

	March 31, 2018
ASSETS
Contract revenues in excess of billings	$	(6,703	)
Other current assets		2,044
Other		5,012
LIABILITIES AND EQUITY
Accrued expenses		361
Billings in excess of contract revenues		1,958
Deferred taxes		(511	)

Accumulated deficit	$	(1,455	)

Summary of Impact of Change in Accounting Principle on Consolidated Statements of Operations

For the three months ended March 31, 2018, the impact of this change in accounting principle on the Consolidated Statements of Operations is as follows:

	Three Months Ended
	March 31,
	2018

Contract revenues	$	(8,661	)
Cost of contract revenues		(6,695	)
Income tax benefit		511
Loss from continuing operations		(1,455	)
Net loss	$	(1,455	)

Comprehensive loss	$	(1,455	)

Restructuring charges (Tables)

3 Months Ended

Mar. 31, 2018

Restructuring And Related Activities [Abstract]

Schedule of Restructuring Charges

Restructuring charges currently recognized for the above actions are summarized as follows:

	Three Months Ended
	March 31, 2018

Costs of contract revenues - depreciation	$	2,992
Costs of contract revenues - other		1,267
General and administrative expenses		7
Gain on sale of assets—net		(7	)
Other income (expense)		2,015
Total Dredging		6,274

General and administrative expenses		168
Total Environmental & Infrastructure		168

Costs of contract revenues - depreciation		2,992
Costs of contract revenues - other		1,267
General and administrative expenses		175
Gain on sale of assets—net		(7	)
Other income (expense)		2,015
Total Consolidated		6,442

Business Combinations And Dispositions (Tables)

3 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Schedule Of Discontinued Operations

The Company estimated its exposure to a surety bond claim, including associated expenses, to be $20,900 and has recorded this amount in discontinued operations during the three months ended March 31, 2017 as follows

	Three Months Ended
	March 31,
	2017

Revenue	$	—

Loss before income taxes from discontinued operations	$	(20,900	)
Income tax benefit		7,835
Loss from discontinued operations, net of income taxes	$	(13,065	)

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721665-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1474-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 20
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-Paragraph 7
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
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-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=84176398&loc=SL51724579-110230

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-Paragraph 5C
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-Paragraph 4A
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-Paragraph 5B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
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-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721659-107760

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721671-107760

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5D
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721677-107760

+ Details

Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Reporting By Segment

	Three Months Ended
	March 31,
	2018			2017
Dredging
Contract revenues	$	133,623		$	153,054
Operating income		2,178			736

Environmental & infrastructure
Contract revenues	$	12,970		$	19,224
Operating loss		(3,218	)		(2,730	)

Intersegment revenues	$	—		$	(1,692	)
Total
Contract revenues	$	146,593		$	170,586
Operating loss		(1,040	)		(1,994	)

Basis of Presentation - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Organization Consolidation and Presentation [Line Items]
Cash and cash equivalents	$ 12,736	$ 15,852
Cash, cash equivalents and restricted cash at end of period	14,236	17,352	$ 8,395	$ 19,702
Accounting Standards Update 2016-18 [Member]
Organization Consolidation and Presentation [Line Items]
Cash and cash equivalents	12,736	15,852
Restricted cash included in other long-term assets	1,500	1,500
Cash, cash equivalents and restricted cash at end of period	$ 14,236	$ 17,352

Basis of Presentation - Schedule of Quarterly Impact of Change in Accounting Policy on Condensed Consolidated Statements of Operations and Condensed Consolidated Balance Sheets (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Organization Consolidation and Presentation [Line Items]
Costs of contract revenues	$ 131,888	$ 155,774
Income tax benefit	(3,295)	(2,793)
Loss from continuing operations	(9,321)	(4,574)
Net loss	(9,321)	(17,639)
Comprehensive loss	$ (8,694)	$ (18,401)
Basic loss per share attributable to continuing operations	$ (0.15)	$ (0.07)
Diluted loss per share attributable to continuing operations	$ (0.15)	$ (0.07)
Prepaid expenses and other current assets	$ 40,933		$ 45,411
Deferred income taxes	21,870		25,561
Accumulated deficit	$ (77,999)		$ (67,101)
Accounting Standards Update 2016-18 [Member] \| Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Organization Consolidation and Presentation [Line Items]
Costs of contract revenues		$ 1,370
Income tax benefit		519
Loss from continuing operations		(851)
Net loss		(851)
Comprehensive loss		$ (851)
Basic loss per share attributable to continuing operations		$ (0.01)
Diluted loss per share attributable to continuing operations		$ (0.01)
Prepaid expenses and other current assets		$ (1,370)
Deferred income taxes		(519)
Accumulated deficit		$ (851)

Basis Of Presentation (Narrative) (Details) $ in Thousands	3 Months Ended
Basis Of Presentation (Narrative) (Details) $ in Thousands	Mar. 31, 2018 USD ($) segment
Organization Consolidation and Presentation [Line Items]
Number of operating Segments	2
Number of reportable segments	2
Number of reportable segments with goodwill	2
Accounting Standards Update 2014-09 [Member] \| Maximum [Member]
Organization Consolidation and Presentation [Line Items]
Cumulative net adjustment to the beginning retained earnings balance \| $	$ 1,950

Earnings Per Share (Narrative) (Detail) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Shares excluded from computation of diluted earnings per share	1,906	1,580
Securities excluded from computation of earnings per share amount due to loss	781	678

Earnings Per Share - (Computations For Basic And Diluted Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Loss from continuing operations	$ (9,321)	$ (4,574)
Loss from discontinued operations, net of income taxes		(13,065)
Net loss	$ (9,321)	$ (17,639)
Weighted-average common shares outstanding — basic	61,815	61,065
Weighted-average common shares outstanding — diluted	61,815	61,065
Loss per share from continuing operations — basic	$ (0.15)	$ (0.07)
Loss per share from continuing operations — diluted	$ (0.15)	$ (0.07)

- Definition

The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

+ References + Details

- Definition

The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References + Details

Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Payables And Accruals [Abstract]
Insurance	$ 13,364	$ 22,941
Interest	10,097	4,210
Payroll and employee benefits	6,730	8,747
Accrued rent	6,079	6,519
Percentage of completion adjustment	3,368	3,591
Income and other taxes	2,602	2,794
Other	10,044	7,416
Total accrued expenses	$ 52,284	$ 56,218

Long-Term Debt (Narrative) (Details) - USD ($)		1 Months Ended		3 Months Ended	24 Months Ended
Long-Term Debt (Narrative) (Details) - USD ($)	Dec. 30, 2016	Feb. 28, 2018	May 31, 2017	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Maximum availability of earnings under credit agreement for five consecutive days				$ 31,250,000
Maximum availability of earnings under credit agreement for one day				25,000,000
Revolving credit facility				91,000,000
Letters of credit outstanding				31,215,000
Letter of credit remaining borrowing capacity				77,070,000
Availability under credit agreement suppressed				50,715,000
Long-term debt, current maturities				1,379,000		$ 2,758,000
Long-term debt, excluding current Maturities				321,280,000		$ 333,141,000
Senior Notes [Member]
Debt Instrument [Line Items]
Face value of senior notes issued, percentage			100.00%
Net proceeds from issuance			$ 321,653,000
Vessels and Ancillary Equipment [Member]
Debt Instrument [Line Items]
Long-term debt, current maturities				1,379,000
Long-term debt, excluding current Maturities				531,000
Net proceeds from sale-leaseback of a vessel yielding		$ 4,500,000
8.000% Senior Notes Due in 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 325,000,000
Debt instrument, interest rate, stated percentage			8.00%
Maturity date			May 15, 2022
Owned Domestic Subsidiaries Percent			100.00%
7.375% Senior Notes Due In 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 275,000,000
Debt instrument, interest rate, stated percentage			7.375%
Maturity date			Feb. 28, 2019
Redemption of notes			$ 282,638,000
Maximum [Member]
Debt Instrument [Line Items]
Expenses related to buy-out operating leases				$ 20,000,000
Fixed charge coverage ratio	1.10%
Maximum [Member] \| Scenario Forecast [Member]
Debt Instrument [Line Items]
Capital expenditures by credit parties					$ 135,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250,000,000
Line of credit facility optional increase capacity	$ 100,000,000
Revolving credit facility, maturity date				Dec. 30, 2019
Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Revolving Credit Facility [Member] \| LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.00%
Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Unused fee percentage	0.375%
Revolving Credit Facility [Member] \| Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%
Revolving Credit Facility [Member] \| Maximum [Member] \| LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.00%
Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Unused fee percentage	0.25%
Revolving Credit Facility [Member] \| Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Revolving Credit Facility [Member] \| Minimum [Member] \| LIBOR Rate [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.50%
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 250,000,000
Swingline Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 25,000,000

Fair Value Measurements (Schedule Of Fair Values Of Financial Instruments And Nonfinancial Assets And Liabilities Measured At The Reporting Date) (Details) - Fuel Hedge Contracts [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ 1,507	$ 2,501
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ 1,507	$ 2,501

Fair Value Measurements (Narrative) (Details) gal in Millions	1 Months Ended	3 Months Ended
	May 31, 2017 USD ($)	Mar. 31, 2018 USD ($) $ / gal gal	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Derivatives Fair Value [Line Items]
Derivative underlying hedge percent		80.00%
Derivative, Nonmonetary Notional Amount, Volume \| gal		6.4
Fair value hedge assets		$ 1,507,000		$ 2,501,000
Reclassification of derivative losses to earnings-net of tax		732,000	$ (40,000)
8.000% Senior Notes Due in 2022 [Member]
Derivatives Fair Value [Line Items]
Debt instrument, face amount	$ 325,000,000
Stated interest rate	8.00%
Maturity date	May 15, 2022
8.000% Senior Notes Due in 2022 [Member] \| Fair Value, Inputs, Level 1 [Member]
Derivatives Fair Value [Line Items]
Fair value of debt		333,125,000
Other Income (Expense) [Member]
Derivatives Fair Value [Line Items]
Reversal of cumulative translation adjustment		$ 2,015,000
Minimum [Member]
Derivatives Fair Value [Line Items]
Fixed price range \| $ / gal		1.53
Maximum [Member]
Derivatives Fair Value [Line Items]
Fixed price range \| $ / gal		2.02

Fair Value Measurements (Schedule Of Fair Value Of Fuel Hedge Contracts Balance Sheet Location) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives Fair Value [Line Items]
Asset derivatives	$ 1,507	$ 2,501
Prepaid Expenses and Other Current Assets [Member] \| Derivatives Designated as Hedging Instruments [Member] \| Fuel Hedge Contracts [Member]
Derivatives Fair Value [Line Items]
Asset derivatives	$ 1,507	$ 2,501

Fair Value Measurements (Changes In Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2018

Mar. 31, 2017

Fair Value Disclosures [Abstract]

Cumulative translation adjustments—net of tax

^[1]

$ 1,361

$ (28)

Reclassification of derivative (gains) losses to earnings—net of tax

(732)

Change in fair value of derivatives—net of tax

(2)

(774)

Net unrealized gain on derivatives—net of tax

^[2]

(734)

Other comprehensive income (loss)—net of tax

$ 627

$ (762)

[1]	Net of income tax (provision) benefit of $(535) and $39 for the three months ended March 31, 2018 and 2017, respectively.
[2]	Net of income tax (provision) benefit of $260 and $(479) for the three months ended March 31, 2018 and 2017, respectively.

Fair Value Measurements (Adjustments Reclassified From Accumulated Balances Other Comprehensive Income (Loss) To Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments Gain Loss [Line Items]
Costs of contract revenues	$ 131,888	$ 155,774
Income tax benefit	3,295	2,793
Net income (loss)	9,321	17,639
Fuel Hedge Contracts [Member] \| Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges \| Reclassification Out Of Accumulated Other Comprehensive Income
Derivative Instruments Gain Loss [Line Items]
Costs of contract revenues	(992)	66
Income tax benefit	260	26
Net income (loss)	$ (732)	$ 40

Share-Based Compensation (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
	May 11, 2017	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units		1,985
Share-based compensation expense		$ 1,009	$ 918
Employees And Directors [Member] \| 2017 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares available for grant	3,300
Employees And Directors [Member] \| 2007 Long-Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Underlying equity awards issued	1,700

Revenue - (Summay of Impact of Change in Accounting Principle on Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Contract revenues in excess of billings	$ 55,122	$ 90,788
Other	17,546	13,128
LIABILITIES AND EQUITY
Accrued expenses	52,284	56,218
Billings in excess of contract revenues	8,772	3,615
Deferred income taxes	21,870	25,561
Accumulated deficit	(77,999)	$ (67,101)
ASU 2014-09 [Member] \| Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
ASSETS
Contract revenues in excess of billings	(6,703)
Other current assets	2,044
Other	5,012
LIABILITIES AND EQUITY
Accrued expenses	361
Billings in excess of contract revenues	1,958
Deferred income taxes	(511)
Accumulated deficit	$ (1,455)

Revenue (Summary of Impact of Change in Accounting Principle on Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Contract revenues	$ 146,593	$ 170,586
Costs of contract revenues	131,888	155,774
Income tax benefit	(3,295)	(2,793)
Loss from continuing operations	(9,321)	(4,574)
Net loss	(9,321)	(17,639)
Comprehensive loss	(8,694)	$ (18,401)
ASU 2014-09 [Member] \| Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Contract revenues	(8,661)
Costs of contract revenues	(6,695)
Income tax benefit	511
Loss from continuing operations	(1,455)
Net loss	(1,455)
Comprehensive loss	$ (1,455)

Revenue (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
Revenue (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018
Revenue Recognition [Line Items]
Revenue, remaining performance obligation	$ 512,999
Percentage of performance obligation to be recognized as revenue	87.00%
Performance obligation, expected to be recognized as revenue year	2018
Remaining performance obligation, expected to be completed	2020
Revenue, description of timing	one year or less
Revenues	$ 146,593	$ 170,586
Costs in excess of billings	17,860
Revenue recognition, included in the billings in excess of contract revenues	2,812
Amortization on pre-construction costs	2,497
Other Current and Noncurrent Assets [Member]
Revenue Recognition [Line Items]
Costs to fulfill a contract with customer recognized as an asset	14,789		$ 7,732
Foreign [Member]
Revenue Recognition [Line Items]
Revenues	5,523	19,154
Dredging [Member] \| Foreign [Member]
Revenue Recognition [Line Items]
Revenues	$ 5,523	$ 19,154

Revenue (Summary of Segment and Type of Work, Contract Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation Of Revenue [Line Items]
Revenues	$ 146,593	$ 170,586
Operating Segment [Member] \| Dredging [Member]
Disaggregation Of Revenue [Line Items]
Revenues	133,623	153,054
Operating Segment [Member] \| Dredging [Member] \| Capital-U.S. [Member]
Disaggregation Of Revenue [Line Items]
Revenues	76,952	66,601
Operating Segment [Member] \| Dredging [Member] \| Capital-Foreign [Member]
Disaggregation Of Revenue [Line Items]
Revenues	5,523	19,154
Operating Segment [Member] \| Dredging [Member] \| Coastal Protection [Member]
Disaggregation Of Revenue [Line Items]
Revenues	41,861	40,335
Operating Segment [Member] \| Dredging [Member] \| Maintenance [Member]
Disaggregation Of Revenue [Line Items]
Revenues	7,803	21,913
Operating Segment [Member] \| Dredging [Member] \| Rivers & Lakes [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1,484	5,051
Operating Segment [Member] \| Environmental And Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 12,970	19,224
Intersegment Revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenues		$ (1,692)

Revenue (Summary of Segment and Type of Customer, Contract Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation Of Revenue [Line Items]
Revenues	$ 146,593	$ 170,586
Federal Government [Member]
Disaggregation Of Revenue [Line Items]
Revenues	76,694	111,494
State and Local Government [Member]
Disaggregation Of Revenue [Line Items]
Revenues	46,625	15,645
Private [Member]
Disaggregation Of Revenue [Line Items]
Revenues	4,781	6,761
Foreign [Member]
Disaggregation Of Revenue [Line Items]
Revenues	5,523	19,154
Dredging [Member] \| Foreign [Member]
Disaggregation Of Revenue [Line Items]
Revenues	5,523	19,154
Operating Segment [Member] \| Dredging [Member]
Disaggregation Of Revenue [Line Items]
Revenues	133,623	153,054
Operating Segment [Member] \| Environmental And Infrastructure [Member]
Disaggregation Of Revenue [Line Items]
Revenues	12,970	19,224
Operating Segment [Member] \| Environmental And Infrastructure [Member] \| Private [Member]
Disaggregation Of Revenue [Line Items]
Revenues	6,364	10,535
Operating Segment [Member] \| Environmental And Infrastructure [Member] \| Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 6,606	8,689
Intersegment Revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenues		$ (1,692)

Revenue (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Completed contracts	$ 27,277	$ 15,974
Contracts in progress	51,541	42,759
Retainage	23,650	21,866
Accounts receivable, gross	102,468	80,599
Allowance for doubtful accounts	(552)	(591)
Total accounts receivable—net	101,916	80,008
Accounts receivable—net	97,441	75,533
Long-term accounts receivable and retainage	$ 4,475	$ 4,475

Revenue (Components of Contracts in Progress) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings in excess of billings for contracts in progress	$ 31,062	$ 67,825
Costs and earnings in excess of billings for completed contracts	24,060	22,963
Total contract revenues in excess of billings	55,122	90,788
Total billings in excess of contract revenues	(8,772)	(3,615)
Costs And Earnings In Excess Of Billings [Member]
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings for contracts in progress	492,739	558,557
Amounts billed	(461,677)	(490,732)
Billings In Excess Of Costs And Earnings [Member]
Accounts Notes And Loans Receivable [Line Items]
Costs and earnings for contracts in progress	237,793	321,735
Amounts billed	$ (246,565)	$ (325,350)

Restructuring Charges (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]
Accrued rent expense	$ 5,348	$ 5,930
Severance expense	$ 1,248	1,567
Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charge		42,000
Restructuring charge related to non-cash		38,000
Minimum [Member] \| Depreciation [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge related to non-cash		12,500
Minimum [Member] \| Loss on Sale of Assets [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge related to non-cash		3,000
Minimum [Member] \| Other Items [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge related to non-cash		21,500
Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charge		47,000
Restructuring charge related to non-cash		43,000
Maximum [Member] \| Depreciation [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge related to non-cash		14,500
Maximum [Member] \| Loss on Sale of Assets [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge related to non-cash		5,000
Maximum [Member] \| Other Items [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charge related to non-cash		23,500
Severance [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charge		3,000
Asset Retirements [Member] \| Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charge		30,000
Asset Retirements [Member] \| Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charge		34,000
Pre-contract Costs [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charge		6,500
Closeout Costs [Member] \| Minimum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charge		2,500
Closeout Costs [Member] \| Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Estimated restructuring charge		$ 3,500

Restructuring Charges (Schedule of Restructuring Charges) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 6,442
Costs of Contract Revenues - Depreciation [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	2,992
Costs of Contract Revenues - Other [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	1,267
General and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	175
Gain on Sale of Assets—Net [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(7)
Other Income (Expense) [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	2,015
Dredging [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	6,274
Dredging [Member] \| Costs of Contract Revenues - Depreciation [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	2,992
Dredging [Member] \| Costs of Contract Revenues - Other [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	1,267
Dredging [Member] \| General and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	7
Dredging [Member] \| Gain on Sale of Assets—Net [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(7)
Dredging [Member] \| Other Income (Expense) [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	2,015
Environmental And Infrastructure [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	168
Environmental And Infrastructure [Member] \| General and Administrative Expenses [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 168

Commitments And Contingencies (Narrative) (Details) - USD ($)			3 Months Ended
	Feb. 28, 2017	Jan. 14, 2015	Mar. 31, 2018	May 31, 2017
Commitments And Contingencies [Line Items]
Outstanding performance bonds			$ 1,211,568,000
Revenue value remaining from outstanding performance bonds			474,902,000
Proceeds from Legal Settlements		$ 5,309,000
Surety Bond [Member]
Commitments And Contingencies [Line Items]
Aggregate demolition surety performance bond	$ 20,000,000
Letter of Credit [Member]
Commitments And Contingencies [Line Items]
Line of credit facility, maximum borrowing capacity				$ 20,881,000
Environmental And Infrastructure Segment [Member]
Commitments And Contingencies [Line Items]
Outstanding performance bonds			41,085,000
Minimum [Member]
Commitments And Contingencies [Line Items]
Bids bond range			$ 1,000,000
Warranty periods			1 year
Maximum [Member]
Commitments And Contingencies [Line Items]
Bids bond range			$ 10,000,000
Warranty periods			3 years

Investments (Details)	Mar. 31, 2018
TerraSea Environmental Solutions [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership percentage	50.00%

Business Combinations And Dispositions (Narrative) (Details) - USD ($) $ in Thousands				3 Months Ended
	Feb. 28, 2017	Nov. 04, 2014	Apr. 23, 2014	Mar. 31, 2018	Dec. 31, 2015
Business Acquisition [Line Items]
Estimated surety bond claim, including associated expenses				$ 20,900
Great Lakes Environmental & Infrastructure, LLC [Member]
Business Acquisition [Line Items]
Maximum potential aggregate earnout payment		$ 11,400
Magnus Pacific Acquisition [Member]
Business Acquisition [Line Items]
Base purchase price		40,000
Payments for previous acquisition		$ 25,000
Fair value of debt					$ 0
Surety Bond [Member]
Business Acquisition [Line Items]
Aggregate demolition surety performance bond	$ 20,000
NASDI, LLC and Yankee Environmental Services, LLC
Business Acquisition [Line Items]
Proceeds from divestiture of businesses			$ 5,309

Business Combinations And Dispositions - (Schedule Of Discontinued Operations) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Business Combinations [Abstract]
Loss before income taxes from discontinued operations	$ (20,900)
Income tax benefit	7,835
Loss from discontinued operations, net of income taxes	$ (13,065)

- Definition

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References + Details

- Definition

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

+ References + Details

- Definition

+ References + Details

Segment Information (Narrative) (Details)	3 Months Ended
Segment Information (Narrative) (Details)	Mar. 31, 2018 segment
Segment Reporting [Abstract]
Number of reportable segments	2

Segment Information (Segment Reporting By Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Contract revenues	$ 146,593	$ 170,586
Operating income (loss)	(1,040)	(1,994)
Dredging Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	2,178	736
Environmental And Infrastructure Segment [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(3,218)	(2,730)
Operating Segment [Member] \| Dredging Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	133,623	153,054
Operating Segment [Member] \| Environmental And Infrastructure Segment [Member]
Segment Reporting Information [Line Items]
Contract revenues	$ 12,970	19,224
Intersegment Revenues [Member]
Segment Reporting Information [Line Items]
Contract revenues		$ (1,692)