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] Entity Address, City or Town Entity Address City Or Town Fair Value Disclosures [Abstract] Earnings Per Share [Abstract] Fair Value, Inputs, Level 1 [Member] Fair Value Inputs Level1 [Member] Accrued Expenses Schedule Of Accrued Liabilities Table [Text Block] Costs to fulfill a contract with customer recognized as an asset Capitalized Contract Cost Gross FINANCING ACTIVITIES: Net Cash Provided By Used In Financing Activities [Abstract] Amendment Flag Amendment Flag Property and equipment purchased but not yet paid Capital Expenditures Incurred But Not Yet Paid Subsequent Event Type Subsequent Event Type [Domain] Goodwill, Ending Balance Goodwill, Beginning Balance Goodwill, Total GOODWILL Goodwill OPERATING LEASE ASSETS Operating Lease Right Of Use Asset Revenue From Contract With Customer [Table] Revenue From Contract With Customer [Table] Revenue from contract with customer table. Document Quarterly Report Document Quarterly Report Debt Instrument [Table] Debt Instrument [Table] Credit facility expiration description Line Of Credit Facility Expiration Description Line of credit facility expiration description. Revenue value remaining from outstanding performance bonds Revenue Value Remaining From Outstanding Performance Bonds Revenue value remaining from outstanding performance bonds. Statement [Table] Statement [Table] OPERATING LEASE LIABILITIES—Noncurrent Operating Lease Liability Noncurrent Subsegments Subsegments [Domain] Number of operating Segments Number Of Operating Segments Federal Government [Member] Federal Government [Member] Federal government. Remaining performance obligation, expected timing of satisfaction, year Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Year1 Construction Contractor, Receivable, Retainage, Total Retainage Construction Contractor Receivable Retainage Total contract revenues in excess of billings Accounts Receivable Billed For Long Term Contracts Or Programs Hedging Relationship Hedging Relationship [Domain] Product and Service Product Or Service [Axis] Employee-related Liabilities, Current, Total Payroll and employee benefits Employee Related Liabilities Current Indemnification Commitment [Member] Indemnification Commitment [Member] Indemnification commitment member. Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total Share-based compensation, shares Stock Issued During Period Shares Share Based Compensation TOTAL Liabilities And Stockholders Equity Plan Name Plan Name [Domain] Cost, Product and Service [Extensible Enumeration] Type Of Cost Good Or Service Extensible List 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] Net change in cash flow derivative foreign currency hedges—net of tax Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax Entity Incorporation, State or Country Code Entity Incorporation State Country Code Income Statement [Abstract] Bids bond range Bids Bond Range Bids bond range. Derivative Liability, Total Derivatives liabilities Derivative Liabilities Operating Segment [Member] Operating Segments [Member] Total current liabilities Liabilities Current Fuel Hedge Contracts [Member] Fuel Hedge Contracts [Member] Fuel hedge contracts. Loss Contingency Nature Loss Contingencies By Nature Of Contingency [Axis] Payment of Financing and Stock Issuance Costs, Total Deferred financing fees Payment Of Financing And Stock Issuance Costs Components of Contracts in Progress Costs In Excess Of Billings And Billings In Excess Of Costs Table [Text Block] Accounts Receivable, Allowance for Credit Loss, Ending Balance Accounts Receivable, Allowance for Credit Loss, Beginning Balance Allowance for doubtful accounts Allowance For Doubtful Accounts Receivable Accrued Expenses Accounts Payable And Accrued Liabilities Disclosure [Text Block] Restitution owe on liability for criminal matters previously deposited Restitution Owe On Liability For Criminal Matters Previously Deposited Restitution owe on liability for criminal matters previously deposited. Billings in excess of contract revenues Increase Decrease In Contract With Customer Liability Energy Energy [Axis] Derivative Asset, Total Derivatives assets Derivative Assets Revenue, Product and Service [Extensible Enumeration] Type Of Revenue Extensible List Variable Rate Variable Rate [Axis] Entity Small Business Entity Small Business Number of reportable segments Number Of Reportable Segments Hedging Relationship Derivative Instruments Gain Loss By Hedging Relationship [Axis] Reclassification Out of Accumulated Other Comprehensive Income [Member] Reclassification Out Of Accumulated Other Comprehensive Income [Member] Total current assets Assets Current Weighted Average Number of Shares Outstanding, Basic, Total Weighted-average common shares outstanding — basic Basic weighted average shares Weighted Average Number Of Shares Outstanding Basic Employees and Directors [Member] Employees And Directors [Member] Employees and directors. City Area Code City Area Code Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Reclassification of derivative (gains) losses to earnings net of cash settlements and taxes Other Comprehensive Income Loss, Gains Reclassified to Earnings From Changes in Fair Value of Derivatives, Net of Cash Settlements and Taxes Other comprehensive income loss, gains reclassified to earnings from changes in fair value of derivatives, net of cash settlements and taxes. Total liabilities Liabilities Document Period End Date Document Period End Date Rivers & Lakes [Member] Rivers Lakes [Member] Rivers & Lakes. 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 values of financial instruments and non-financial assets and liabilities measured. Statistical Measurement Range [Axis] Green Loan Option [Member] Green Loan Option [Member] Green loan option. TOTAL Assets Accounts receivable—net Accounts Receivable Excluding Contract Receivable Current Accounts receivable excluding contract receivable current. Debt instrument covenant description Debt Instrument, Covenant Description Increased gross profit Increased Gross Profit Increased gross profit. Long-Term Debt, Excluding Current Maturities, Total LONG-TERM DEBT Long Term Debt Noncurrent Earnings Per Share, Diluted, Total Earnings (loss) per share — diluted Diluted earnings (loss) per share Earnings Per Share Diluted Entity Address, Postal Zip Code Entity Address Postal Zip Code Owned Domestic Subsidiaries Percent Owned Domestic Subsidiaries Percent Owned domestic subsidiaries percent. Document Fiscal Period Focus Document Fiscal Period Focus Cost of Goods and Services Sold, Total Costs of contract revenues Costs of contract revenues Cost Of Goods And Services Sold Accounts receivable Increase Decrease In Accounts Receivable Revolving Credit Facility [Member] Revolving Credit Facility [Member] Performance obligation, expected to be recognized as revenue year Performance Obligation Expected To Be Recognized As Revenue Year Performance obligation expected to be recognized as revenue, year. Cash used in financing activities Net Cash Provided By Used In Financing Activities Amortization of deferred financing fees Amortization Of Deferred Financing Cost And Other Non Cash Interest Expense Amortization of deferred financing cost and other non cash interest expense. Statement Of Financial Position [Abstract] Entity File Number Entity File Number Gain (Loss) on Disposition of Assets for Financial Service Operations, Total Gain on sale of assets Gains Losses On Sales Of Assets Line of credit facility optional increase capacity Line Of Credit Facility Optional Increase Capacity Line of credit facility optional increase capacity. Statement Of Cash Flows [Abstract] Availability under credit agreement suppressed Line Of Credit Facility Current Borrowing Capacity Private [Member] Private [Member] Private. Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Total Net unrealized gain (loss) on derivatives, tax Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification Tax Proceeds from issuance of debt Proceeds from Issuance of Debt Geographical Segment Geographical [Domain] Statistical Measurement Range [Member] Statement Of Stockholders Equity [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Reclassification out of Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income [Axis] Exercise of options and purchases from employee stock plans Proceeds From Stock Options Exercised Domestic Rate [Member] Domestic Rate [Member] Domestic rate. Deferred Income Tax Expense (Benefit), Total Deferred income taxes Deferred Income Tax Expense Benefit Weighted Average Number of Shares Outstanding, Diluted, Adjustment, Total Effect of stock options and restricted stock units Weighted Average Number Diluted Shares Outstanding Adjustment DEFERRED INCOME TAXES Deferred Income Tax Liabilities Net Revenue Revenue From Contract With Customer [Text Block] Cancellation of treasury stock, shares Treasury Stock Shares Retired Aggregate demolition surety performance bond Loss Contingency Damages Sought Value Proceeds from Legal Settlements Proceeds From Legal Settlements Line of credit facility, maximum borrowing capacity Line Of Credit Facility Maximum Borrowing Capacity Vesting of restricted stock units and impact of shares withheld for taxes, value Vesting Of Restricted Stock Units Value And Impact Of Shares Withheld For Taxes Vesting of restricted stock units value and impact of shares withheld for taxes. Subsegments Subsegments [Axis] Costs and earnings in excess of billings for completed contracts Costs And Earnings In Excess Of Billings For Completed Contracts Costs and earnings in excess of billings for completed contracts. Total billings in excess of contract revenues Billings in excess of contract revenues Contract With Customer Liability Current Loss Contingency, Nature Loss Contingency Nature [Domain] Amortization on pre-construction costs Capitalized Contract Cost Amortization Credit Facility Credit Facility [Domain] Weighted-average common shares outstanding — diluted Diluted weighted average shares Weighted Average Number Of Diluted Shares Outstanding Credit Facility Credit Facility [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Total Net change in cash flow derivative hedges—net of tax Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax 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 Increase decrease in costs in excess of billings on uncompleted contracts or programs expected to be collected within one year. Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations OTHER Other Assets Noncurrent Entity Address, Address Line One Entity Address Address Line1 Derivatives Fair Value [Line Items] Derivatives Fair Value [Line Items] Reclassification of derivative losses (gains) to earnings-net of tax Reclassification of derivative (gains) losses to earnings net of tax Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax Supplemental Cash Flow Information Supplemental Cash Flow Information [Abstract] Income tax provision Income Tax Expense (Benefit), Total Income tax (provision) benefit Income Tax Expense Benefit Proceeds from loss of use claim Proceeds From Loss Of Use Claim Proceeds from loss of use claim. Balance Sheet Location Balance Sheet Location [Domain] Other Other Accrued Liabilities Current Payments to Acquire Property, Plant, and Equipment, Total Purchases of property and equipment Payments To Acquire Property Plant And Equipment Revenue, remaining performance obligation Revenue Remaining Performance Obligation Disaggregation Of Revenue [Abstract] Outstanding performance bonds Outstanding Performance Bonds Outstanding performance bonds. Fair Value Hedges, Net, Total Fair value hedges Fair Value Hedges At Fair Value Net Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Operating income (loss) Operating Income Loss Debt instrument, interest rate, stated percentage Debt Instrument Interest Rate Stated Percentage Underlying equity awards issued Share Based Compensation Arrangement By Share Based Payment Award Shares Issued In Period Additional paid-in capital Additional Paid In Capital Common Stock Entity Filer Category Entity Filer Category Entity Current Reporting Status Entity Current Reporting Status Inventory, Net, Total Inventories Inventory Net Inventory, Noncurrent, Total INVENTORIES—Noncurrent Inventory Noncurrent Total equity BALANCE - value BALANCE - value Stockholders Equity Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income [Member] Entity Tax Identification Number Entity Tax Identification Number Common stock-$.0001 par value; 90,000 authorized, 66,167 and 65,746 shares issued and outstanding at September 30, 2022 and December 31, 2021, respectively. Common Stock Value Consolidation Items Consolidation Items [Axis] Retained Earnings (Accumulated Deficit), Total Retained earnings Retained Earnings Accumulated Deficit Retained Earnings (Accumulated Deficit) [Member] Statement Equity Components [Axis] Disaggregation Of Revenue [Table] Disaggregation Of Revenue [Table] Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total Accounts payable and accrued expenses Increase Decrease In Accounts Payable And Accrued Liabilities Entity Emerging Growth Company Entity Emerging Growth Company Completed contracts Accounts Receivable Billed For Long Term Completed Contracts Or Programs Accounts receivable billed for long term completed contracts or programs. Fixed price range Derivative Swap Type Fixed Price Schedule of Accounts Receivable Schedule Of Accounts Notes Loans And Financing Receivable [Text Block] Document Transition Report Document Transition Report Foreign [Member] Foreign [Member] Foreign. Depreciation, Depletion and Amortization, Total Depreciation and amortization Depreciation Depletion And Amortization Changes in Components of Accumulated Other Comprehensive Income (Loss) Schedule Of Accumulated Other Comprehensive Income Loss Table [Text Block] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated Other Comprehensive Income Loss Net Of Tax Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Energy Energy [Domain] Other Comprehensive Income (Loss), Net of Tax, Total Other comprehensive income (loss) net of tax Other Comprehensive Income Loss Net Of Tax Net income (loss) Net income (loss) Net income (loss) Net income (loss) Net Income Loss Operating lease liabilities Operating Lease Liability Current Fair value hedge liabilities Fair Value Hedge Liabilities At Fair Value Additional Paid-In Capital [Member] Additional Paid In Capital [Member] Taxes paid on settlement of vested share awards Payments Related To Tax Withholding For Share Based Compensation Taxes Payable, Current, Total Income and other taxes Taxes Payable Current Revolving credit facility, maturity date Line Of Credit Facility Expiration Date1 Entity Registrant Name Entity Registrant Name Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Earnings Per Share Earnings Per Share [Text Block] Maturity date Debt Instrument Maturity Date Share-Based Payment Arrangement, Noncash Expense, Total Share-based compensation expense Share Based Compensation 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 contracts in progress. Statement Of Income And Comprehensive Income [Abstract] Property, Plant and Equipment, Net, Total PROPERTY AND EQUIPMENT—Net Property Plant And Equipment Net Statement [Line Items] Statement [Line Items] Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total Share-based compensation, value Stock Issued During Period Value Share Based Compensation Title of 12(b) Security Security12b Title Insurance Accrued Insurance Current Common Stock [Member] Common Stock [Member] Derivative notional amount Derivative Notional Amount OPERATING ACTIVITIES: Net Cash Provided By Used In Operating Activities [Abstract] Equity Component Equity Component [Domain] Revenue from Contract with Customer, Excluding Assessed Tax Contract revenues Revenue From Contract With Customer Excluding Assessed Tax Income (loss) before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Entity Address, State or Province Entity Address State Or Province Geographical Statement Geographical [Axis] Net decrease in cash, cash equivalents and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Document Type Document Type Maximum covenant percentage of undrawn availability of amended credit agreement Maximum Covenant Percentage of Undrawn Availability of Amended Credit Agreement Maximum covenant percentage of undrawn availability of amended credit agreement. Receivables [Abstract] Entity Shell Company Entity Shell Company Other noncurrent assets and liabilities Increase Decrease In Other Noncurrent Assets And Liabilities Net Increase (Decrease) in Inventories, Total Inventories Increase Decrease In Inventories 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 Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fine paid for criminal matters Fine Paid For Criminal Matters Fine paid for criminal matters. Security Exchange Name Security Exchange Name Accounts receivable, gross Accounts Receivable Gross Revenue From Contract With Customer [Abstract] Cash provided by (used in) operating activities Net Cash Provided By Used In Operating Activities Foreign Currency Exchange Hedge Contracts [Member] Foreign Currency Exchange Hedge Contracts [Member] Foreign currency exchange hedge contracts. Commitments And Contingencies Disclosure [Abstract] Performance obligations exclude from dredging backlog Performance Obligations Exclude From Dredging Backlog Performance obligations exclude from dredging backlog. Billings In Excess Of Costs And Earnings [Member] Billings In Excess Of Costs And Earnings [Member] Billings in excess of costs and earnings. Interest Interest Payable Current Schedule Of Accounts Notes Loans And Financing Receivable [Table] Schedule Of Accounts Notes Loans And Financing Receivable [Table] Other Current and Noncurrent Assets [Member] Other Current And Noncurrent Assets [Member] Other current and noncurrent assets. Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock, shares outstanding Common Stock Shares Outstanding Fine for violation Fine For Violation Fine for violation. Level 2 [Member] Fair Value Inputs Level2 [Member] INVESTING ACTIVITIES: Net Cash Provided By Used In Investing Activities [Abstract] Green Loan Advance Rates [Member] Green Loan Advance Rates [Member] Green loan advance rates. COMMITMENTS AND CONTINGENCIES (Note 8) Commitments And Contingencies Common stock, shares issued Common Stock Shares Issued Receivable Type Accounts Notes Loans And Financing Receivable By Receivable Type [Axis] Variable Rate Variable Rate [Domain] Change in fair value of derivatives—net of tax Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax Minimum [Member] Minimum [Member] Segments Segment [Domain] Total accrued expenses Accrued expenses Accrued Liabilities Current Debt Instrument Debt Instrument [Axis] EQUITY: Stockholders Equity [Abstract] Entity Address, Address Line Two Entity Address Address Line2 Construction Contractor, Receivable, Excluding Contract Retainage, after Year One, Total Long-term contract revenues in excess of billings Contract Receivable Due After One Year Segments Statement Business Segments [Axis] Receivable Receivable Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Contracts in progress Accounts Receivable Billed For Long Term Contracts Or Programs In Progress Accounts receivable billed for long term contracts or programs in progress. Debt Instrument, Fair Value Disclosure, Total Fair value of debt Debt Instrument Fair Value Capital-Foreign [Member] Capital Dredging Foreign [Member] Capital dredging - Foreign. Basis of Presentation Basis Of Presentation And Significant Accounting Policies [Text Block] Other Nonoperating Income (Expense), Total Other income (expense) Other Nonoperating Income Expense Entity Central Index Key Entity Central Index Key State and Local Government [Member] State And Local Government [Member] State and local government. Restricted cash included in other long-term assets Restricted Cash Equivalents Restricted Cash Equivalents, Total Disaggregation Of Revenue [Line Items] Disaggregation Of Revenue [Line Items] Consolidation Items Consolidation Items [Domain] 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 Share-Based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] General and Administrative Expense, Total General and administrative expenses General And Administrative Expense Organization Consolidation And Presentation Of Financial Statements [Abstract] Adjustments to reconcile net income (loss) to net cash flows provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Retained Earnings (Accumulated Deficit) [Member] Retained Earnings [Member] Fixed price range Derivative Forward Price Daily Simple SOFR Rate [Member] Secured Overnight Financing Rate Sofr Overnight Index Swap Rate [Member] Current portion of contract revenues in excess of billings Contract revenues in excess of billings Contract Receivable Due One Year Or Less 2029 Notes [Member] Two Thousand Twenty Nine Notes [Member] 2029 Notes. Total accounts receivable—net Accounts Receivable Net Entity Interactive Data Current Entity Interactive Data Current Letters of credit outstanding Letters Of Credit Outstanding Amount 8.000% Senior Notes Due in 2022 [Member] Eight Percent Senior Notes Due In Two Thousand Twenty Two [Member] Eight percent senior notes due in two thousand twenty two. Costs And Earnings In Excess Of Billings [Member] Costs And Earnings In Excess Of Billings [Member] Costs and earnings in excess of billings. Non-cash Investing and Financing Activities Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Reclassification out of Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income [Domain] Dredging [Member] Dredging [Member] Dredging. Local Phone Number Local Phone Number Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments and contingencies. Cash paid for interest Interest Paid Net Of Cash Received Interest paid net of cash received. Contract reserves Accrued Contract Reserves Liabilities Current Accrued contract reserves liabilities current. Computations for Basic and Diluted Earnings (Loss) Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Debt Disclosure [Abstract] Type of Customer [Member] Type Of Customer [Member] Type of customer. Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Maintenance [Member] Maintenance Dredging [Member] Maintenance dredging. Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Summary of Contract Revenues by Type of Work and Customer Disaggregation Of Revenue Table [Text Block] OTHER Other Liabilities Noncurrent Type of Work [Member] Type Of Work [Member] Type of work. BALANCE - shares BALANCE - shares Shares Outstanding Letter of credit remaining borrowing capacity Line Of Credit Facility Remaining Borrowing Capacity Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Fixed charge coverage ratio Fixed Charge Coverage Ratio Fixed charge coverage ratio. Debt Instrument, Name Debt Instrument Name [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Repayments of debt Repayments of Debt Earnings Per Share, Basic, Total Earnings (loss) per share — basic Basic earnings (loss) per share Earnings Per Share Basic ASSETS Assets [Abstract] Gross profit Gross Profit Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Debt instrument, face amount Debt Instrument Face Amount Interest expense—net Interest Income Expense Nonoperating Net Crude Oil [Member] Crude Oil [Member] Derivative underlying hedge percent Derivative Underlying Hedge Percent Derivative underlying hedge percent. LIABILITIES AND EQUITY Liabilities And Stockholders Equity [Abstract] Income Taxes Paid, Net, Total Cash paid for income taxes Income Taxes Paid Net Accounts Notes And Loans Receivable [Line Items] Accounts Notes And Loans Receivable [Line Items] Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Profit Loss CURRENT ASSETS: Assets Current [Abstract] Coastal Protection [Member] Beach Nourishment Dredging [Member] Beach nourishment dredging. Cancellation of treasury stock, value Treasury Stock Retired Cost Method Amount Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Amounts billed Billings For Contracts In Progress Billings for contracts in progress. Payables And Accruals [Abstract] Changes in assets and liabilities: Increase Decrease In Operating Capital [Abstract] Revolving credit facility Lines Of Credit Current Cover [Abstract] Derivative, nonmonetary notional amount, volume Derivative Nonmonetary Notional Amount Volume Product and Service Products And Services [Domain] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments and contingencies. Maximum [Member] Maximum [Member] Derivative Instruments Gain Loss [Line Items] Derivative Instruments Gain Loss [Line Items] Cash used in investing activities Net Cash Provided By Used In Investing Activities Exercise of stock options and purchases from employee stock purchase plan, shares Stock Issued During Period Shares Stock Options Exercised Warranty periods Warranty Periods Warranty periods. 2007 Long-Term Incentive Plan [Member] Two Thousand Seven Long Term Incentive Plan [Member] Two thousand seven long-term incentive plan. Debt instrument, basis spread on variable rate Debt Instrument Basis Spread On Variable Rate1 Exercise of stock options and purchases from employee stock purchase plan, value Stock Issued During Period Value Stock Options Exercised 2017 Long-Term Incentive Plan [Member] Two Thousand Seventeen Long Term Incentive Plan [Member] Two thousand seventeen long-term incentive plan. Fair value hedge assets Fair Value Hedge Assets At Fair Value Common stock, shares authorized Common Stock Shares Authorized Quantity of oil spill Quantity Of Oil Spill Quantity of oil spill. Trading Symbol Trading Symbol Adjustments Reclassified from Accumulated Balances Other Comprehensive Income (Loss) to Earnings Reclassification Out Of Accumulated Other Comprehensive Income Table [Text Block] Capital-U.S. [Member] Capital Dredging U S [Member] Capital dredging - U.S. Accumulated Gain Loss Net Cash Flow Hedge Parent [Member] Accumulated Gain Loss Net Cash Flow Hedge Parent [Member] Potential liability for criminal matters Potential Liability For Criminal Matters Potential liability for criminal matters. Title of Individual Title Of Individual With Relationship To Entity [Domain] Subsequent Event Type Subsequent Event Type [Axis] Vesting of restricted stock units and impact of shares withheld for taxes, shares Vesting Of Restricted Stock Units Shares And Impact Of Shares Withheld For Taxes Vesting of restricted stock units shares and impact of shares withheld for taxes. Balance Sheet Location Balance Sheet Location [Axis] Comprehensive income (loss) Comprehensive Income Net Of Tax Proceeds from Sale of Property, Plant, and Equipment, Total Proceeds from dispositions of property and equipment Proceeds From Sale Of Property Plant And Equipment Accounts Payable, Current, Total Accounts payable Accounts Payable Current Plan Name Plan Name [Axis] Title of Individual Title Of Individual [Axis] Costs and earnings for contracts in progress Costs And Earnings For Contracts In Progress Costs and earnings for contracts in progress. Common stock, par value Common Stock Par Or Stated Value Per Share Number of reportable segment with goodwill Number Of Reportable Segments With Goodwill Number of reportable segments with goodwill. Gain on sale of assets-net Gain Loss On Disposition Of Assets Revenue From Contract With Customer [Line Items] Revenue From Contract With Customer [Line Items] Revenue from contract with customer line items. Restricted stock units Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Long-Term Debt Long Term Debt [Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Stock options and restricted stock, excluded from computation of earnings per share Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Percentage of performance obligation to be recognized as revenue Percentage Of Performance Obligation To Be Recognized As Revenue Percentage of performance obligation to be recognized as revenue.