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Commitments and Contingencies (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
project
Jun. 30, 2023
Jun. 30, 2024
USD ($)
project
customer
Jun. 30, 2023
Dec. 31, 2023
USD ($)
Loss Contingencies [Line Items]          
Line of credit facility, letters of credit issued $ 83,900   $ 83,900   $ 82,100
Cash and cash equivalents 297,586   297,586   529,561
Indemnities, accrued project close-out liabilities $ 20,000   $ 20,000   $ 20,000
Number of customers | customer     1,080    
One Customer | Accounts Receivable, Net, Less Deferred Revenue | Customer Concentration Risk          
Loss Contingencies [Line Items]          
Concentration risk, percentage of total         10.00%
Ten Largest Customers | Revenue Benchmark | Customer Concentration Risk          
Loss Contingencies [Line Items]          
Concentration risk, percentage of total 36.00% 35.00% 39.00% 36.00%  
Self-Insurance | Workers' Compensation, General and Automobile Policies          
Loss Contingencies [Line Items]          
Self-insurance reserve $ 217,600   $ 217,600   $ 209,700
Self-Insurance | Employee Group Medical Claims          
Loss Contingencies [Line Items]          
Self-insurance reserve 5,500   5,500   4,100
Other Long-Term Liabilities | Self-Insurance | Workers' Compensation, General and Automobile Policies          
Loss Contingencies [Line Items]          
Self-insurance reserve, non-current 153,700   153,700   141,000
Corporate Joint Venture          
Loss Contingencies [Line Items]          
Cash and cash equivalents $ 62,800   $ 62,800   38,100
Corporate Joint Venture | Joint Venture Civil Construction Project          
Loss Contingencies [Line Items]          
Number of joint ventures | project 5   5    
Corporate Joint Venture | Minimum | Joint Ventures That Provide Electrical Transmission Infrastructure Services          
Loss Contingencies [Line Items]          
Proportionately consolidated non-controlled joint venture, ownership percentage 85.00%   85.00%    
Corporate Joint Venture | Minimum | Joint Venture Civil Construction Project          
Loss Contingencies [Line Items]          
Proportionately consolidated non-controlled joint venture, ownership percentage 25.00%   25.00%    
Corporate Joint Venture | Maximum | Joint Ventures That Provide Electrical Transmission Infrastructure Services          
Loss Contingencies [Line Items]          
Proportionately consolidated non-controlled joint venture, ownership percentage 90.00%   90.00%    
Corporate Joint Venture | Maximum | Joint Venture Civil Construction Project          
Loss Contingencies [Line Items]          
Proportionately consolidated non-controlled joint venture, ownership percentage 50.00%   50.00%    
Captive Insurance Company          
Loss Contingencies [Line Items]          
Cash and cash equivalents $ 2,100   $ 2,100   1,200
Performance and Payment Bonds          
Loss Contingencies [Line Items]          
Bonded projects, estimated costs to complete 2,100,000   2,100,000   1,600,000
Commercial and/or Financial Standby | Self-Insurance | Workers' Compensation, General and Automobile Policies          
Loss Contingencies [Line Items]          
Line of credit facility, letters of credit issued 9,100   9,100   9,600
Surety Bonds | Self-Insurance | Workers' Compensation          
Loss Contingencies [Line Items]          
Guarantor obligations, maximum exposure, undiscounted 190,000   190,000   192,700
Subsidiaries | Performance and Payment Bonds          
Loss Contingencies [Line Items]          
Guarantor obligations, maximum exposure, undiscounted 6,700,000   6,700,000   5,600,000
Subsidiaries | Performance and Payment Bonds | Corporate Joint Venture          
Loss Contingencies [Line Items]          
Guarantor obligations, maximum exposure, undiscounted $ 825,200   $ 825,200   $ 368,300