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Commitments and Contingencies - Letters of Credit, Bonds, Self-Insurance, Multiemployer Plans, Indemnities - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended
Oct. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Commitments and Contingencies [Line Items]      
Letters of credit issued   $ 162,400 $ 188,500
Cash   95,676 360,736
Indemnities, accrued project close-out liabilities   40,000 40,000
Pension      
Commitments and Contingencies [Line Items]      
Withdrawal liability   3,300 3,400
Pension | Subsequent Event      
Commitments and Contingencies [Line Items]      
Payments to settle withrawal liability $ 2,800    
Pension | HMG      
Commitments and Contingencies [Line Items]      
Quarterly benefit payment   74  
Corporate Joint Venture      
Commitments and Contingencies [Line Items]      
Cash   15,100 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   178,800 189,800
Self-Insurance | Workers' Compensation, General and Automobile Policies | Other Long-Term Liabilities      
Commitments and Contingencies [Line Items]      
Self-insurance reserve, non-current   107,400 126,500
Self-Insurance | Employee Group Medical Claims      
Commitments and Contingencies [Line Items]      
Self-insurance reserve   4,200  
Performance and Payment Bonds      
Commitments and Contingencies [Line Items]      
Bonded projects, estimated costs to complete   775,000 768,800
Performance and Payment Bonds | Subsidiaries      
Commitments and Contingencies [Line Items]      
Outstanding bonds, amount   2,351,700 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   103,000 125,700
Surety Bonds | Self-Insurance | Workers' Compensation      
Commitments and Contingencies [Line Items]      
Outstanding bonds, amount   $ 110,900 $ 52,900