Entity Central Index Key Accounts receivable, noncurrent and contract receivable retainage. Investments in subsidiaries. Investments in subsidiaries liability. Equity in earnings (loss) of joint venture through business units. Income (loss) from equity investments in subsidiaries. Net change in accounts with affiliates Proceeds to repayments from parent in investing activities. Seven point three seven five senior notes tender premium. Proceeds from equipment debt. Payment of senior notes tender premium. Net change in accounts with affiliates, in finance activities. Proceeds to repayments from parent. Document and Entity Information Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Eight percent senior notes due in two thousand twenty two. 8% SENIOR NOTES [Member] Eight Percent Senior Notes Due In Two Thousand Twenty Two [Member] Seven point three seven five senior notes due in two thousand nineteen. 7 3/8% SENIOR NOTES [Member] Seven Point Three Seven Five Senior Notes Due In Two Thousand Nineteen [Member] Statement [Line Items] Statement [Line Items] ASSETS Assets [Abstract] CURRENT ASSETS: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Accounts receivable—net Accounts Receivable Net Current Contract revenues in excess of billings Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year Inventories Inventory Net Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current PROPERTY AND EQUIPMENT—Net Property Plant And Equipment Net GOODWILL AND OTHER INTANGIBLE ASSETS—Net Intangible Assets Net Including Goodwill INVENTORIES—Noncurrent Inventory Noncurrent INVESTMENTS IN JOINT VENTURES Investments In Affiliates Subsidiaries Associates And Joint Ventures ASSETS HELD FOR SALE—Noncurrent Disposal Group Including Discontinued Operation Assets Noncurrent OTHER Other Assets Noncurrent TOTAL Assets LIABILITIES AND EQUITY Liabilities And Stockholders Equity [Abstract] Accounts payable Accounts Payable Current Accrued expenses Accrued Liabilities Current Billings in excess of contract revenues Billings In Excess Of Cost Current portion of long term debt Long Term Debt Current Total current liabilities Liabilities Current SENIOR NOTES Senior Long Term Notes REVOLVING CREDIT FACILITY Long Term Line Of Credit NOTES PAYABLE Long Term Notes Payable DEFERRED INCOME TAXES Deferred Tax Liabilities Noncurrent Deferred Tax Assets Deferred Tax Assets Liabilities Net Noncurrent PAYABLES TO AFFILIATES Due To Affiliate Noncurrent OTHER Other Liabilities Noncurrent Total liabilities Liabilities COMMITMENTS AND CONTINGENCIES (Note 8) Commitments And Contingencies Common stock—$.0001 par value; 90,000 authorized, 61,683 and 61,240 shares issued; 61,405 and 60,962 shares outstanding at June 30, 2017 and December 31, 2016, respectively. Common Stock Value Treasury stock, at cost Treasury Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated deficit Retained Earnings Accumulated Deficit Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Total equity Stockholders Equity TOTAL Liabilities And Stockholders Equity Debt instrument, interest rate, stated percentage Debt Instrument Interest Rate Stated Percentage Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Income Statement [Abstract] Contract revenues Revenues Costs of contract revenues Contract Revenue Cost Gross profit Gross Profit General and administrative expenses General And Administrative Expense Loss on sale of assets—net Gains Losses On Sales Of Assets Operating income Operating Income Loss Interest expense—net Interest Income Expense Nonoperating Net Equity in earnings (loss) of joint ventures Equity In Earning Loss Of Joint Venture Through Business Units Loss on extinguishment of debt Gains Losses On Extinguishment Of Debt Other expense Other Nonoperating Income Expense Loss from continuing operations before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Income tax benefit Income Tax Expense Benefit Loss from continuing operations Income Loss From Continuing Operations Income (loss) from discontinued operations, net of income taxes Income Loss From Discontinued Operations Net Of Tax Net loss Net Income Loss Basic loss per share attributable to continuing operations Income Loss From Continuing Operations Per Basic Share Basic loss per share attributable to discontinued operations, net of tax Income Loss From Discontinued Operations Net Of Tax Per Basic Share Basic loss per share Earnings Per Share Basic Basic weighted average shares Weighted Average Number Of Shares Outstanding Basic Diluted loss per share attributable to continuing operations Income Loss From Continuing Operations Per Diluted Share Diluted loss per share attributable to discontinued operations, net of tax Income Loss From Discontinued Operations Net Of Tax Per Diluted Share Diluted loss per share Earnings Per Share Diluted Diluted weighted average shares Weighted Average Number Of Diluted Shares Outstanding Statement Of Income And Comprehensive Income [Abstract] Net loss Currency translation adjustment—net of tax Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax Net unrealized gain on derivatives—net of tax Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax Other comprehensive income (loss)—net of tax Other Comprehensive Income Loss Net Of Tax Comprehensive loss Comprehensive Income Net Of Tax Currency translation adjustment, tax Other Comprehensive Income Foreign Currency Translation Gain Loss Arising During Period Tax Net unrealized (gain) loss on derivatives, tax Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax Vesting of restricted stock units shares including impact of shares withheld for taxes. Vesting of restricted stock units value including impact of shares withheld for taxes. Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock [Member] Common Stock [Member] Treasury Stock [Member] Treasury Stock [Member] Additional Paid-In Capital [Member] Additional Paid In Capital [Member] Accumulated Deficit [Member] Retained Earnings [Member] Accumulated Other Comprehensive Loss [Member] Accumulated Other Comprehensive Income [Member] BALANCE - value BALANCE - shares Shares Outstanding Share-based compensation, value Stock Issued During Period Value Share Based Compensation Share-based compensation, shares Stock Issued During Period Shares Share Based Compensation Vesting of restricted stock units, including impact of shares withheld for taxes, value Vesting Of Restricted Stock Units Value Including Impact Of Shares Withheld For Taxes Vesting of restricted stock units, including impact of shares withheld for taxes, shares Vesting Of Restricted Stock Units Shares Including Impact Of Shares Withheld For Taxes Exercise of options and purchases from employee stock plans, value Stock Issued During Period Value Stock Options Exercised Exercise of options and purchases from employee stock plans, shares Stock Issued During Period Shares Stock Options Exercised Net loss Other comprehensive Income (loss)—net of tax BALANCE - value BALANCE - shares Cash distributions from joint ventures. Amortization of deferred financing cost and other non cash interest expense. Increase decrease in costs in excess of billings on uncompleted contracts or programs expected to be collected within one year. Statement Of Cash Flows [Abstract] OPERATING ACTIVITIES: Net Cash Provided By Used In Operating Activities [Abstract] Loss from discontinued operations, net of income taxes Loss from continuing operations Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation Depletion And Amortization Equity in earnings of joint ventures Income Loss From Equity Method Investments Cash distributions from joint ventures Cash Distributions From Joint Ventures Loss on extinguishment of 7 3/8% senior notes Deferred income taxes Deferred Income Tax Expense Benefit Loss on sale of assets Amortization of deferred financing fees Amortization Of Deferred Financing Cost And Other Non Cash Interest Expense Unrealized net (gain) loss from mark-to-market valuations of derivatives Unrealized Gain Loss On Derivatives Unrealized foreign currency gain Foreign Currency Transaction Gain Loss Unrealized Share-based compensation expense Share Based Compensation Changes in assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Contract revenues in excess of billings Increase Decrease In Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year Inventories Increase Decrease In Inventories Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable and accrued expenses Increase Decrease In Accounts Payable And Accrued Liabilities Billings in excess of contract revenues Increase Decrease In Billing In Excess Of Cost Of Earnings Other noncurrent assets and liabilities Increase Decrease In Other Noncurrent Assets And Liabilities Net Net cash flows provided by operating activities of continuing operations Net Cash Provided By Used In Operating Activities Continuing Operations Net cash flows used in operating activities of discontinued operations Cash Provided By Used In Operating Activities Discontinued Operations Cash provided by (used in) operating activities Net Cash Provided By Used In Operating Activities INVESTING ACTIVITIES: Net Cash Provided By Used In Investing Activities [Abstract] Purchases of property and equipment Payments To Acquire Property Plant And Equipment Proceeds from dispositions of property and equipment Proceeds From Sale Of Property Plant And Equipment Changes in restricted cash Increase Decrease In Restricted Cash Cash used in investing activities Net Cash Provided By Used In Investing Activities FINANCING ACTIVITIES: Net Cash Provided By Used In Financing Activities [Abstract] Proceeds from issuance of 8% senior notes Proceeds From Issuance Of Senior Long Term Debt Redemption of 7 3/8% senior notes Repayments Of Senior Debt 7 3/8% senior notes tender premium Seven Point Three Seven Five Senior Notes Tender Premium Deferred financing fees Payment Of Financing And Stock Issuance Costs Repayments of long term note payable Repayments Of Long Term Debt Repayments of term loan facility Repayments Of Short Term Debt Proceeds from equipment debt Proceeds From Equipment Debt Repayments of equipment debt Repayments Of Long Term Capital Lease Obligations Taxes paid on settlement of vested share awards Payments Related To Tax Withholding For Share Based Compensation Exercise of options and purchases from employee stock plans Proceeds From Stock Options Exercised Borrowings under revolving loans Proceeds From Long Term Lines Of Credit Repayments of revolving loans Repayments Of Long Term Lines Of Credit Cash provided by financing activities Net Cash Provided By Used In Financing Activities Effect of foreign currency exchange rates on cash and cash equivalents Effect Of Exchange Rate On Cash And Cash Equivalents Net increase in cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental Cash Flow Information Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid Net Cash paid (refunded) for income taxes Income Taxes Paid Net Non-cash Investing and Financing Activities Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Property and equipment purchased but not yet paid Capital Expenditures Incurred But Not Yet Paid Organization Consolidation And Presentation Of Financial Statements [Abstract] Basis Of Presentation Basis Of Presentation And Significant Accounting Policies [Text Block] Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Receivables [Abstract] Accounts receivable and contracts in progress Loans Notes Trade And Other Receivables Disclosure [Text Block] Payables And Accruals [Abstract] Accrued Expenses Accounts Payable And Accrued Liabilities Disclosure [Text Block] Debt Disclosure [Abstract] Long-Term Debt Long Term Debt [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Share-Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments And Contingencies Commitments And Contingencies Disclosure [Text Block] Equity Method Investments And Joint Ventures [Abstract] Investments Cost And Equity Method Investments Disclosure [Text Block] Business Combinations [Abstract] Business Combinations And Dispositions Business Acquisition Integration Restructuring And Other Related Costs [Text Block] Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Condensed Financial Information Of Parent Company Only Disclosure [Abstract] Subsidiary Guarantors Condensed Financial Information Of Parent Company Only Disclosure [Text Block] Recent Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Computations For Basic And Diluted Loss Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule Of Accounts Receivable Schedule Of Accounts Notes Loans And Financing Receivable [Text Block] Components Of Contracts In Progress Costs In Excess Of Billings And Billings In Excess Of Costs Table [Text Block] Accrued Expenses Schedule Of Accrued Liabilities Table [Text Block] Schedule of Fair Values Of Financial Instruments and Nonfinancial Assets and Liabilities Measured (Table) (Text Block) Schedule Of Fair Values Of Financial Instruments And Nonfinancial Assets And Liabilities Measured At The Reporting Date Schedule Of Fair Values Of Financial Instruments And Nonfinancial Assets And Liabilities Measured Table [Text Block] Schedule Of Fair Value Of Fuel Hedge Contracts Balance Sheet Location Fair Value By Balance Sheet Grouping [Text Block] Changes In Components Of Accumulated Other Comprehensive Income (Loss) Schedule Of Accumulated Other Comprehensive Income Loss Table [Text Block] Adjustments Reclassified From Accumulated Balances Other Comprehensive Income (Loss) To Earnings Reclassification Out Of Accumulated Other Comprehensive Income Table [Text Block] Schedule Of Discontinued Operations Schedule Of Disposal Groups Including Discontinued Operations Income Statement Balance Sheet And Additional Disclosures [Text Block] Segment Reporting By Segment Schedule Of Segment Reporting Information By Segment [Text Block] Condensed Consolidating of Balance Sheet Schedule Of Condensed Balance Sheet Table [Text Block] Schedule of condensed consolidating operations and comprehensive income. Condensed Consolidating Operations And Comprehensive Income (Loss) Schedule Of Condensed Consolidating Operations And Comprehensive Income Table [Text Block] Condensed Consolidating Statement of Cash Flows Schedule Of Condensed Cash Flow Statement Table [Text Block] Equipment-related costs, percentage of costs of contract revenue. Average equipment-related costs of total costs of contract revenue Equipment Related Costs Percentage Of Costs Of Contract Revenue Number of reportable segments with goodwill. Number of operating Segments Number Of Operating Segments Number of reportable segments Number Of Reportable Segments Number of reportable segments with goodwill Number Of Reportable Segments With Goodwill Securities excluded from computation of earnings per share amount due to loss. Shares excluded from computation of diluted earnings per share Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Securities excluded from computation of earnings per share amount due to loss Securities Excluded From Computation Of Earnings Per Share Amount Due To Loss Weighted-average common shares outstanding — basic Effect of stock options and restricted stock units Weighted Average Number Diluted Shares Outstanding Adjustment Weighted-average common shares outstanding — diluted Loss per share from continuing operations — basic Loss per share from continuing operations — diluted Accounts receivable billed for long term completed contracts or programs. Accounts receivable billed for long term contracts or programs in progress. Completed contracts Accounts Receivable Billed For Long Term Completed Contracts Or Programs Contracts in progress Accounts Receivable Billed For Long Term Contracts Or Programs In Progress Retainage Contract Receivable Retainage Accounts receivable, gross Accounts Receivable Gross Allowance for doubtful accounts Allowance For Doubtful Accounts Receivable Total accounts receivable—net Accounts Receivable Net Current portion of accounts receivable—net Long-term accounts receivable and retainage Accounts Receivable Noncurrent And Contract Receivable Retainage Costs and earnings for contracts in progress. Billings for contracts in progress. Costs and earnings in excess of billings for contracts in progress. Costs and earnings in excess of billings for completed contracts. Schedule Of Accounts Notes Loans And Financing Receivable [Table] Schedule Of Accounts Notes Loans And Financing Receivable [Table] Receivable Type Accounts Notes Loans And Financing Receivable By Receivable Type [Axis] Receivable Receivable Type [Domain] Costs and earnings in excess of billings. Costs And Earnings In Excess Of Billings [Member] Costs And Earnings In Excess Of Billings [Member] Billings in excess of costs and earnings. Billings In Excess Of Costs And Earnings [Member] Billings In Excess Of Costs And Earnings [Member] Accounts Notes And Loans Receivable [Line Items] Accounts Notes And Loans Receivable [Line Items] Costs and earnings for contracts in progress Costs And Earnings For Contracts In Progress Amounts billed Billings For Contracts In Progress Costs and earnings in excess of billings for contracts in progress Costs And Earnings In Excess Of Billings For Contracts In Progress Costs and earnings in excess of billings for completed contracts Costs And Earnings In Excess Of Billings For Completed Contracts Total contract revenues in excess of billings Total billings in excess of contract revenues Costs in excess of billings Costs In Excess Of Billings On Uncompleted Contracts Or Programs Retained earnings accumulated deficit in joint ventures. Fuel hedge contracts. Accrued liabilities adjustments under percentage of completion method. Insurance Accrued Insurance Current Payroll and employee benefits Employee Related Liabilities Current Interest Interest Payable Current Accumulated deficit in joint ventures Retained Earnings Accumulated Deficit In Joint Ventures Fuel hedge contracts Fuel Hedge Contracts Percentage of completion adjustment Accrued Liabilities Adjustments Under Percentage Of Completion Method Income and other taxes Taxes Payable Current Other Other Accrued Liabilities Current Total accrued expenses Line of credit facility optional increase capacity. Debt Instrument [Table] Debt Instrument [Table] Credit Facility Credit Facility [Axis] Credit Facility Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Standby Letters of Credit [Member] Standby Letters Of Credit [Member] Swingline loans. Swingline Loans [Member] Swingline Loans [Member] Range Range [Axis] Range Range [Member] Maximum [Member] Maximum [Member] Variable Rate Variable Rate [Axis] Variable Rate Variable Rate [Domain] Base Rate [Member] Base Rate [Member] LIBOR Rate [Member] London Interbank Offered Rate L I B O R [Member] Minimum [Member] Minimum [Member] Prior revolving credit agreement. Prior Revolving Credit Agreement [Member] Prior Revolving Credit Agreement [Member] Prior secured term loan facility. Prior Secured Term Loan Facility [Member] Prior Secured Term Loan Facility [Member] 8.000% Senior Notes Due in 2022 [Member] 7.375% Senior Notes Due In 2019 [Member] Long-term Debt, Type Longterm Debt Type [Axis] Long-term Debt, Type Longterm Debt Type [Domain] Senior Notes [Member] Senior Notes [Member] Vessels and ancillary equipment. Vessels and Ancillary Equipment [Member] Vessels And Ancillary Equipment [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Line of credit facility, maximum borrowing capacity Line Of Credit Facility Maximum Borrowing Capacity Line of credit facility optional increase capacity Line Of Credit Facility Optional Increase Capacity Fixed charge coverage ratio. Fixed charge coverage ratio Fixed Charge Coverage Ratio Revolving credit facility, maturity date Line Of Credit Facility Expiration Date1 Revolving credit facility, description Line Of Credit Facility Description Debt instrument, basis spread on variable rate Debt Instrument Basis Spread On Variable Rate1 Unused fee percentage Line Of Credit Facility Unused Capacity Commitment Fee Percentage Revolving credit facility Lines Of Credit Current Letters of credit outstanding Letters Of Credit Outstanding Amount Letter of credit remaining borrowing capacity Line Of Credit Facility Remaining Borrowing Capacity Repayments of lines of credit Repayments Of Lines Of Credit Payment of secured term loan Repayments Of Secured Debt Term loan facility bear interest fixed rate Long Term Debt Percentage Bearing Fixed Interest Rate Face value of senior notes issued, percentage. Redemption of notes. Debt instrument, face amount Debt Instrument Face Amount Maturity date Debt Instrument Maturity Date Face value of senior notes issued, percentage Face Value Of Senior Notes Issued Percentage Net proceeds from issuance Proceeds From Issuance Of Debt Redemption of notes Redemption Of Notes Long-term debt, current maturities Long-term debt, excluding current Maturities Long Term Debt Noncurrent Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Hedging Relationship Derivative Instruments Gain Loss By Hedging Relationship [Axis] Hedging Relationship Hedging Relationship [Domain] Fuel hedge contracts. Fuel Hedge Contracts [Member] Fuel Hedge Contracts [Member] Fair Value, Hierarchy Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value Inputs Level1 [Member] Significant Other Observable Inputs (Level 2) [Member] Fair Value Inputs Level2 [Member] Significant Unobservable Inputs (Level 3) [Member] Fair Value Inputs Level3 [Member] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value, Net Asset (Liability) Fair Value Net Asset Liability Derivative underlying hedge percent. Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table] Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table] Derivatives Fair Value [Line Items] Derivatives Fair Value [Line Items] Derivative underlying hedge percent Derivative Underlying Hedge Percent Derivative, Nonmonetary Notional Amount, Volume Derivative Nonmonetary Notional Amount Volume Fixed price range Derivative Swap Type Fixed Price Fair value hedge assets Fair Value Hedge Assets At Fair Value Fair value hedge liabilities Fair Value Hedge Liabilities At Fair Value Reclassification of derivative losses to earnings-net of tax Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Net Of Tax Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Prepaid Expenses and Other Current Assets [Member] Other Current Assets [Member] Accrued expenses. Accrued Expenses [Member] Accrued Expenses [Member] Hedging Designation Hedging Designation [Axis] Hedging Designation Hedging Designation [Domain] Derivatives Designated as Hedging Instruments [Member] Designated As Hedging Instrument [Member] Derivatives Not Designated as Hedging Instruments [Member] Nondesignated [Member] Asset derivatives Liability derivatives Derivative Fair Value Of Derivative Liability Cumulative translation adjustments—net of tax Reclassification of derivative losses to earnings—net of tax Change in fair value of derivatives—net of tax Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax Net unrealized gain on derivatives—net of tax Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] Reclassification out of Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income [Domain] Reclassification Out Of Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income [Member] Derivative Instruments Gain Loss [Line Items] Derivative Instruments Gain Loss [Line Items] Costs of contract revenues Income tax benefit Net income (loss) Debt instrument, face amount Stated interest rate Maturity date Fair value of debt Debt Instrument Fair Value Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Title of Individual Title Of Individual [Axis] Relationship to Entity Title Of Individual With Relationship To Entity [Domain] Employees and directors. Employees And Directors [Member] Employees And Directors [Member] Plan Name Plan Name [Axis] Plan Name Plan Name [Domain] Two thousand seventeen long-term incentive plan. 2017 Long-Term Incentive Plan [Member] Two Thousand Seventeen Long Term Incentive Plan [Member] Two thousand seven long-term incentive plan. 2007 Long-Term Incentive Plan [Member] Two Thousand Seven 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 [Line Items] Share-based compensation arrangement by share-based payment award, number of shares available for grant Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Underlying equity awards issued Share Based Compensation Arrangement By Share Based Payment Award Shares Issued In Period Restricted stock units Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Bids bond range. Outstanding performance bonds. Revenue value remaining from outstanding performance bonds. Commitments and contingencies. Commitments and contingencies. Commitments And Contingencies [Table] Commitments And Contingencies [Table] Segments Statement Business Segments [Axis] Segments Segment [Domain] Environmental and infrastructure segment. Environmental And Infrastructure Segment [Member] Environmental And Infrastructure Segment [Member] Letter of Credit [Member] Letter Of Credit [Member] Loss Contingency Nature Loss Contingencies By Nature Of Contingency [Axis] Loss Contingency, Nature Loss Contingency Nature [Domain] Surety Bond [Member] Surety Bond [Member] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Bids bond range Bids Bond Range Outstanding performance bonds Outstanding Performance Bonds Revenue value remaining from outstanding performance bonds Revenue Value Remaining From Outstanding Performance Bonds Aggregate demolition surety performance bond Loss Contingency Damages Sought Value Line of credit, borrowing capacity Warranty periods. Warranty periods Warranty Periods Proceeds from Legal Settlements Proceeds From Legal Settlements Loss from funding to joint venture. Schedule Of Equity Method Investments [Table] Schedule Of Equity Method Investments [Table] Investment, Name Schedule Of Equity Method Investment Equity Method Investee Name [Axis] Investment, Name Equity Method Investee Name [Domain] TerraSea Environmental Solutions. TerraSea Environmental Solutions [Member] Terrasea Environmental Solutions [Member] Schedule Of Equity Method Investments [Line Items] Schedule Of Equity Method Investments [Line Items] Ownership percentage Equity Method Investment Ownership Percentage Loss from joint venture Loss From Funding To Joint Venture Schedule Of Business Acquisitions By Acquisition [Table] Schedule Of Business Acquisitions By Acquisition [Table] Operating Activities Statement Operating Activities Segment [Axis] Operating Activities Segment Operating Activities [Domain] NASDI, LLC and Yankee Environmental Services, LLC Segment Discontinued Operations [Member] Business Acquisition Business Acquisition [Axis] Business Acquisition, Acquiree Business Acquisition Acquiree [Domain] Magnus Pacific acquisition. Magnus Pacific Acquisition [Member] Magnus Pacific Acquisition [Member] Legal Entity Legal Entity [Axis] Entity Entity [Domain] Great Lakes Environmental & Infrastructure LLC. Great Lakes Environmental & Infrastructure, LLC [Member] Great Lakes Environmental And Infrastructure L L C [Member] Five point seven point senior notes due two thousand twenty three. 5.75% Senior Notes Due In 2023 [Member] Five Point Seven Point Senior Notes Due Two Thousand Twenty Three [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Proceeds from divestiture of businesses Proceeds From Divestiture Of Businesses Loss contingency damages sought estimated value. Estimated surety bond claim, including associated expenses Loss Contingency Damages Sought Estimated Value Revenue Disposal Group Including Discontinued Operation Revenue Loss before income taxes from discontinued operations Discontinued Operation Income Loss From Discontinued Operation Before Income Tax Income tax benefit Discontinued Operation Tax Effect Of Discontinued Operation Loss from discontinued operations, net of income taxes Base purchase price Business Acquisition Cost Of Acquired Entity Transaction Costs Payments for previous acquisition Payments For Previous Acquisition Maximum potential aggregate earnout payment. Fair value of debt Maximum potential aggregate earnout payment Maximum Potential Aggregate Earnout Payment Schedule Of Segment Reporting Information By Segment [Table] Schedule Of Segment Reporting Information By Segment [Table] Dredging segment. Dredging Segment [Member] Dredging Segment [Member] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] Foreign [Member] Non Us [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Consolidation Items Consolidation Items [Axis] Consolidation Items Consolidation Items [Domain] Operating Segment [Member] Operating Segments [Member] Intersegment Revenues [Member] Intersegment Elimination [Member] Operating income (loss) Owned domestic subsidiaries percent. Schedule Of Condensed Financial Statements [Table] Schedule Of Condensed Financial Statements [Table] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements Captions [Line Items] Owned Domestic Subsidiaries Percent Owned Domestic Subsidiaries Percent Reportable Legal Entities [Member] Reportable Legal Entities [Member] Consolidation Eliminations [Member] Consolidation Eliminations [Member] Consolidated Entities Consolidated Entities [Axis] Consolidated Entities Consolidated Entities [Domain] Guarantor Subsidiaries [Member] Guarantor Subsidiaries [Member] Non Guarantor Subsidiaries [Member] Non Guarantor Subsidiaries [Member] GLDD Corporation [Member] Parent Company [Member] RECEIVABLES FROM AFFILIATES Due From Affiliate Noncurrent INVESTMENTS IN SUBSIDIARIES Investments In Subsidiaries INVESTMENTS IN SUBSIDIARIES Investments In Subsidiaries Liability TOTAL EQUITY General and administrative expenses Interest expense—net Equity in earnings (loss) of subsidiaries Income Loss From Equity Investments In Subsidiaries Equity in earnings (loss) of joint ventures Other income (expense) Income tax (provision) benefit Comprehensive income (loss) Net cash flows provided by (used in) operating activities of continuing operations Net change in accounts with affiliates Payments For Proceeds From Accounts With Affiliates Transfer to parent Proceeds To Repayments From Parent In Investing Activities 7 3/8% senior notes tender premium Payment Of Senior Notes Tender Premium Net change in accounts with affiliates Net Change In Accounts With Affiliates In Finance Activities Transfer to parent Proceeds To Repayments From Parent