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Billings For Contracts In Progress Amounts billed Document Type Document Type Construction Contractor, Receivable, Excluding Contract Retainage, Year One Contract revenues in excess of billings Current portion of contract revenues in excess of billings Line of Credit Facility, Current Borrowing Capacity Availability under credit agreement suppressed Net Cash Provided by (Used in) Investing Activities Cash used in investing activities Document Quarterly Report Document Quarterly Report Derivative, Notional Amount Derivative notional amount Net Cash Provided by (Used in) Financing Activities Cash (used in) provided by financing activities Debt Instrument Redemption Period Debt Instrument, Redemption, Period [Domain] Entity Filer Category Entity Filer Category Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Non-cash Investing and Financing Activities Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Net change in cash flow derivative foreign currency hedges—net of tax Commitments and contingencies. Commitments And Contingencies [Table] Commitments And Contingencies [Table] Balance Sheet Location [Domain] Balance Sheet Location Other operating gains. Other Operating Gains Other gains Other gains Percentage of prepayment of principal loan amount Percentage Of Prepayment Of Principal Loan Amount Percentage of prepayment of principal loan amount. Variable Rate [Axis] Variable Rate Reclassification of derivative losses (gains) to earnings - net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Reclassification of derivative losses (gains) to earnings net of tax Reclassification of derivative (gains) losses to earnings net of tax Reclassification of derivative gain (losses) to earnings net of tax Accrued fuel hedge contracts liabilities current. Accrued Fuel Hedge Contracts Liabilities Current Fuel hedge contracts Capital Expenditures Incurred but Not yet Paid Property and equipment purchased but not yet paid Liabilities Total liabilities Warranty periods. Warranty Periods Warranty periods Construction Contractor, Receivable, Excluding Contract Retainage Total contract revenues in excess of billings Two thousand seven long-term incentive plan. Two Thousand Seven Long Term Incentive Plan [Member] 2007 Long-Term Incentive Plan [Member] Equity, Attributable to Parent BALANCE - value BALANCE - value Total equity Subsegments [Axis] Subsegments Asset based revolving credit facility. Asset Based Revolving Credit Facility [Member] ABL Amendment [Member] Term SOFR Loan [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Net Loss Net income (loss) Net income (loss) Anti-dilutive due to period loss. Anti-dilutive Due to Period Loss [Member] Statement of Financial Position [Abstract] Basis of Presentation and Significant Accounting Policies [Text Block] Basis of Presentation Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Share-based compensation, shares Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total Weighted Average Number of Shares Outstanding, Diluted Diluted weighted average shares Weighted-average common shares outstanding — diluted Two thousand seventeen long-term incentive plan. Two Thousand Seventeen Long Term Incentive Plan [Member] 2017 Long-Term Incentive Plan [Member] Credit Facility [Axis] Credit Facility Gain (Loss) on Disposition of Assets for Financial Service Operations Gain on sale of assets Gain (Loss) on Disposition of Assets for Financial Service Operations, Total Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] Capital dredging - U.S. Capital Dredging U S [Member] Capital-U.S. [Member] Loan prepayment period Loan Prepayment Period Loan prepayment period. 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 Vesting of restricted stock units and impact of shares withheld for taxes, shares Derivative Asset Derivatives assets Derivative Asset, Total Computations for Basic and Diluted Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Disaggregation of Revenue [Line Items] Disaggregation Of Revenue [Line Items] Costs and earnings for contracts in progress. Costs And Earnings For Contracts In Progress Costs and earnings for contracts in progress Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Fair Value Disclosures [Abstract] Number of reportable segments with goodwill. Number Of Reportable Segments With Goodwill Number of reportable segment with goodwill Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment, Total Capitalized Contract Cost, Gross Costs to fulfill a contract with customer recognized as an asset 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 Payroll and employee benefits Employee-related Liabilities, Current, Total Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash at beginning of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total 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