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Summary of Contract Revenues by Type of Work and Customer Disaggregation of Revenue [Table Text Block] Total billings in excess of contract revenues Billings in excess of contract revenues Contract with Customer, Liability, Current 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. Title of Individual Title of Individual [Domain] Fair value hedge assets Fair Value Hedge Assets Federal Government [Member] Federal Government [Member] Federal government. 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Entity Address, City or Town Entity Address, City or Town Subsequent Event [Member] Subsequent Event [Member] Subsequent Event Type Subsequent Event Type [Axis] 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. 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Energy Energy [Domain] Total current liabilities Liabilities, Current Entity Tax Identification Number Entity Tax Identification Number Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 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. Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Fair Values Derivatives Balance Sheet Location By Derivative Contract Type By Hedging Designation [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] 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. Plan Name Plan Name [Axis] Revolving credit facility Line of Credit, Current Geographical Geographical [Domain] TOTAL Assets OPERATING LEASE ASSETS Operating Lease, Right-of-Use Asset Green Loan Option [Member] Green Loan Option [Member] Green loan option. Entity Registrant Name Entity Registrant Name Retained Earnings (Accumulated Deficit), Total Retained earnings Retained Earnings (Accumulated Deficit) Supplemental Cash Flow Information Supplemental Cash Flow Information [Abstract] Accounts receivable—net Accounts Receivable Excluding Contract Receivable Current Accounts receivable excluding contract receivable current. Retained Earnings [Member] Retained Earnings [Member] DEFERRED INCOME TAXES Deferred Income Tax Liabilities, Net Increased gross profit Increased Gross Profit Increased gross profit. Minimum [Member] Minimum [Member] Exercise of options and purchases from employee stock plans Proceeds from Stock Options Exercised Disaggregation of Revenue [Abstract] Equity Component Equity Component [Domain] Segments Segments [Axis] Receivables [Abstract] Owned Domestic Subsidiaries Percent Owned Domestic Subsidiaries Percent Owned domestic subsidiaries percent. 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] Debt Disclosure [Abstract] Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Entity Current Reporting Status Entity Current Reporting Status Common stock, shares authorized Common Stock, Shares Authorized 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. Disbursement amount from litigation escrow account Disbursement Amount From Litigation Escrow Account Disbursement amount from litigation escrow account. 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Revenue Revenue from Contract with Customer [Text Block] Cancellation of treasury stock, shares Treasury Stock, Shares, Retired Debt instrument, face amount Debt Instrument, Face Amount Hedging Relationship Hedging Relationship [Domain] 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 [Domain] Other expense (income) Other Nonoperating Income (Expense), Total Other income (expense) Other Nonoperating Income (Expense) 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. Derivative Instruments Gain Loss By Hedging Relationship By Income Statement Location By Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Commitments and Contingencies Disclosure [Abstract] OTHER Other Assets, Noncurrent Other Other Accrued Liabilities, Current 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. 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Revolving Credit Facility [Member] Revolving Credit Facility [Member] Earnings Per Share, Basic, Total Earnings (loss) per share — basic Basic earnings (loss) per share Earnings Per Share, Basic Changes in Components of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] COMMITMENTS AND CONTINGENCIES (Note 8) Commitments and Contingencies Remaining performance obligation, expected timing of satisfaction, year Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year Income Statement [Abstract] Outstanding performance bonds Outstanding Performance Bonds Outstanding performance bonds. Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Statistical Measurement Statistical Measurement [Domain] Cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Income Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent, Total Document Period End Date Document Period End Date Statistical Measurement Statistical Measurement [Axis] Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Ending Balance Accounts Receivable, Allowance for Credit Loss, Beginning Balance Accounts Receivable, Allowance for Credit Loss Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Accounts Notes And Loans Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Earnings Per Share, Diluted, Total Earnings (loss) per share — diluted Diluted earnings (loss) per share Earnings Per Share, Diluted Product and Service Product and Service [Domain] Repayments of revolving loans Repayments of Long-Term Lines of Credit Revenue from Contract with Customer [Abstract] Components of Contracts in Progress Long-Term Contract or Program Disclosure [Table Text Block] Debt Instrument, Name Debt Instrument, Name [Domain] Derivative, nonmonetary notional amount, volume Derivative, Nonmonetary Notional Amount, Volume Derivative Liability, Total Derivatives liabilities Derivative Liability Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Loss Contingency, Nature Loss Contingency, Nature [Domain] Number of reportable segments Number of Reportable Segments Line of credit facility suppressed capacity Line Of Credit Facility Suppressed capacity, Line of credit facility suppressed capacity. 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Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Derivative Instruments Gain Loss [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Derivatives Fair Value [Line Items] Derivatives, Fair Value [Line Items] Retained Earnings (Accumulated Deficit) [Member] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Local Phone Number Local Phone Number Goodwill, Ending Balance Goodwill, Beginning Balance Goodwill, Total GOODWILL Goodwill Foreign [Member] Foreign [Member] Foreign. Statement of Cash Flows [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated Other Comprehensive Income (Loss), Net of Tax Gross profit Gross Profit Other income related to settlement Other Income Common stock, par value Common Stock, Par or Stated Value Per Share Interest expense—net Interest Income (Expense), Nonoperating, Net Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Maximum [Member] Maximum [Member] Consolidation Items Consolidation Items [Domain] Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Domain] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Payables and Accruals [Abstract] 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. Operating Segment [Member] Operating Segments [Member] City Area Code City Area Code Inventory, Net, Total Inventories Inventory, Net OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Consolidation Items Consolidation Items [Axis] Fair Value Hedges, Net, Total Fair value hedges Fair Value Hedges, Net General and Administrative Expense, Total General and administrative expenses General and Administrative Expense 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 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. 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Fair value hedge liabilities Fair Value Hedge Liabilities Performance obligations exclude from dredging backlog Performance Obligations Exclude From Dredging Backlog Performance obligations exclude from dredging backlog. Letters of credit outstanding Letters of Credit Outstanding, Amount Construction Contractor, Receivable, Retainage, Total Retainage Construction Contractor, Receivable, Retainage Billings In Excess Of Costs And Earnings [Member] Billings In Excess Of Costs And Earnings [Member] Billings in excess of costs and earnings. Other Current and Noncurrent Assets [Member] Other Current And Noncurrent Assets [Member] Other current and noncurrent assets. Common Stock [Member] Common Stock [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Aggregate demolition surety performance bond Loss Contingency, Damages Sought, Value Fine for violation Fine For Violation Fine for violation. Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Green Loan Advance Rates [Member] Green Loan Advance Rates [Member] Green loan advance rates. Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Loss from discontinued operations, net of income taxes Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent, Total Antidilutive Securities, Name [Domain] Cover [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Cash paid (received) for income taxes Income Taxes Paid, Net, Total Income Taxes Paid, Net Other noncurrent assets and liabilities Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net Interest Interest Payable, Current Reclassification Out of Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income [Member] Security Exchange Name Security Exchange Name 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. Capital-Foreign [Member] Capital Dredging Foreign [Member] Capital dredging - Foreign. Percentage of Fair Value of Reporting Unit in Excess of Carrying Value Percentage of Fair Value of Reporting Unit in Excess of Carrying Value Percentage of fair value of reporting unit in excess of carrying value. Exercise of options and purchases from employee stock purchase plan, value Stock Issued During Period, Value, Stock Options Exercised Entity Emerging Growth Company Entity Emerging Growth Company Amendment Flag Amendment Flag Inventory, Noncurrent, Total INVENTORIES—Noncurrent Inventory, Noncurrent Accrued Expenses Schedule of Accrued Liabilities [Table Text Block] Amortization on pre-construction costs Capitalized Contract Cost, Amortization State and Local Government [Member] State And Local Government [Member] State and local government. 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Entity Address, Address Line Two Entity Address, Address Line Two Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Number of operating Segments Number of Operating Segments Title of Individual Title of Individual [Axis] 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. Earnings (Loss) Per Share Earnings Per Share [Text Block] Dredging [Member] Dredging [Member] Dredging. Entity Address, Address Line One Entity Address, Address Line One Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments and contingencies. Antidilutive Securities [Axis] 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. Subsequent Event Type Subsequent Event Type [Domain] Type of Customer [Member] Type Of Customer [Member] Type of customer. Maintenance [Member] Maintenance Dredging [Member] Maintenance dredging. Cost, Product and Service [Extensible Enumeration] Cost, Product and Service [Extensible Enumeration] Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Type of Work [Member] Type Of Work [Member] Type of work. Insurance Accrued Insurance, Current Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Underlying equity awards issued Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Depreciation, Depletion and Amortization, Total Depreciation and amortization Depreciation, Depletion and Amortization Product and Service Product and Service [Axis] Fixed charge coverage ratio Fixed Charge Coverage Ratio Fixed charge coverage ratio. 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Crude Oil [Member] Crude Oil [Member] Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock, shares outstanding Common Stock, Shares, Outstanding Share-Based Compensation Share-Based Payment Arrangement [Text Block] Schedule of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Coastal Protection [Member] Beach Nourishment Dredging [Member] Beach nourishment dredging. Expected funds to be released in connection with pre-purchase construction project Expected Funds To Be Released In Connection With Pre-purchase Construction Project Expected funds to be released in connection with pre-purchase construction project. 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Document Type Document Type Current portion of contract revenues in excess of billings Contract revenues in excess of billings Construction Contractor, Receivable, Excluding Contract Retainage, Year One Availability under credit agreement suppressed Line of Credit Facility, Current Borrowing Capacity One-time payment amount Litigation Settlement, Amount Awarded from Other Party Cash used in investing activities Net Cash Provided by (Used in) Investing Activities Document Quarterly Report Document Quarterly Report Derivative notional amount Derivative, Notional Amount Cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Entity Filer Category Entity Filer Category Non-cash Investing and Financing Activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Net change in cash flow derivative foreign currency hedges—net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments and contingencies. 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Total contract revenues in excess of billings Construction Contractor, Receivable, Excluding Contract Retainage 2007 Long-Term Incentive Plan [Member] Two Thousand Seven Long Term Incentive Plan [Member] Two thousand seven long-term incentive plan. Benefit in cost of contract revenues Benefit in cost of contract revenues. Total equity BALANCE - value BALANCE - value Equity, Attributable to Parent Subsegments Subsegments [Axis] Daily Simple SOFR Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Net income (loss) Net income (loss) Net income (loss) Net income (loss) Net Income (Loss) Anti-dilutive Due to Period Loss [Member] Anti-dilutive due to period loss. Statement of Financial Position [Abstract] Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total Share-based compensation, shares Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Weighted-average common shares outstanding — diluted Diluted weighted average shares Weighted Average Number of Shares Outstanding, Diluted 2017 Long-Term Incentive Plan [Member] Two Thousand Seventeen Long Term Incentive Plan [Member] Two thousand seventeen long-term incentive plan. Credit Facility Credit Facility [Axis] Gain (Loss) on Disposition of Assets for Financial Service Operations, Total Gain on sale of assets Gain (Loss) on Disposition of Assets for Financial Service Operations Quantity of oil spill Quantity Of Oil Spill Quantity of oil spill. 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Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Fair Value Disclosures [Abstract] Number of reportable segment with goodwill Number Of Reportable Segments With Goodwill Number of reportable segments with goodwill. Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Payments to Acquire Property, Plant, and Equipment, Total Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Costs to fulfill a contract with customer recognized as an asset Capitalized Contract Cost, Gross Revenue From Contract With Customer [Line Items] Revenue From Contract With Customer [Line Items] Revenue from contract with customer line items. Employee-related Liabilities, Current, Total Payroll and employee benefits Employee-related Liabilities, Current 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 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.