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Commitments and Contingencies - Letters of Credit, Bonds, Self-Insurance, Multiemployer Plans, Indemnities - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Commitments and Contingencies [Line Items] |  |
Letters of credit issued | $ 215,800 | $ 188,500
Cash | 138,929 | 360,736
Indemnities, accrued project close-out liabilities | 40,000 | 40,000
Pension |  |
Commitments and Contingencies [Line Items] |  |
Withdrawal liability | 3,300 | 3,400
Pension | HMG |  |
Commitments and Contingencies [Line Items] |  |
Quarterly benefit payment | 74 |
Corporate Joint Venture |  |
Commitments and Contingencies [Line Items] |  |
Cash | 13,100 | 14,600
Captive Insurance Company |  |
Commitments and Contingencies [Line Items] |  |
Cash | 300 | 300
Self-Insurance | Workers' Compensation, General and Automobile Policies |  |
Commitments and Contingencies [Line Items] |  |
Self-insurance reserve | 190,800 | 189,800
Self-Insurance | Workers' Compensation, General and Automobile Policies | Other Long-Term Liabilities |  |
Commitments and Contingencies [Line Items] |  |
Self-insurance reserve, non-current | 125,400 | 126,500
Self-Insurance | Employee Group Medical Claims |  |
Commitments and Contingencies [Line Items] |  |
Self-insurance reserve | 4,400 | 4,200
Performance and Payment Bonds |  |
Commitments and Contingencies [Line Items] |  |
Bonded projects, estimated costs to complete | 770,700 | 768,800
Performance and Payment Bonds | Subsidiaries |  |
Commitments and Contingencies [Line Items] |  |
Outstanding bonds, amount | 2,154,300 | 2,155,200
Performance and Payment Bonds | Subsidiaries | Corporate Joint Venture |  |
Commitments and Contingencies [Line Items] |  |
Outstanding bonds, amount | 115,000 | 115,000
Financial Guarantees | Self-Insurance | Workers' Compensation, General and Automobile Policies |  |
Commitments and Contingencies [Line Items] |  |
Letters of credit issued | 154,300 | 125,700
Surety Bonds | Self-Insurance | Workers' Compensation |  |
Commitments and Contingencies [Line Items] |  |
Outstanding bonds, amount | $ 52,900 | $ 52,900

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