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Commitments and Contingencies - Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 28, 2023
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2023
USD ($)
project
Jun. 30, 2022
Jun. 30, 2023
USD ($)
project
customer
Jun. 30, 2022
Dec. 31, 2022
USD ($)
Loss Contingencies [Line Items]              
Line of credit facility, letters of credit issued     $ 128,200,000   $ 128,200,000   $ 166,700,000
Cash and cash equivalents     119,905,000   119,905,000   370,592,000
Indemnities, accrued project close-out liabilities     20,000,000   $ 20,000,000   40,000,000
Number of customers | customer         1,305    
Workers' Compensation, General and Automobile Policies | Self-Insurance              
Loss Contingencies [Line Items]              
Self-insurance reserve     196,000,000   $ 196,000,000   176,700,000
Workers' Compensation, General and Automobile Policies | Self-Insurance | Other Long-Term Liabilities              
Loss Contingencies [Line Items]              
Self-insurance reserve, non-current     123,900,000   123,900,000   109,300,000
Employee Group Medical Claims | Self-Insurance              
Loss Contingencies [Line Items]              
Self-insurance reserve     4,400,000   4,400,000   4,100,000
Corporate Joint Venture              
Loss Contingencies [Line Items]              
Cash and cash equivalents     $ 23,200,000   $ 23,200,000   25,700,000
Corporate Joint Venture | Joint Ventures That Provide Electrical Transmission Infrastructure Services | Minimum              
Loss Contingencies [Line Items]              
Proportionately consolidated non-controlled joint venture, ownership percentage     85.00%   85.00%    
Corporate Joint Venture | Joint Ventures That Provide Electrical Transmission Infrastructure Services | Maximum              
Loss Contingencies [Line Items]              
Proportionately consolidated non-controlled joint venture, ownership percentage     90.00%   90.00%    
Corporate Joint Venture | Joint Venture Civil Construction Project              
Loss Contingencies [Line Items]              
Number of joint ventures | project     4   4    
Corporate Joint Venture | Joint Venture Civil Construction Project | Minimum              
Loss Contingencies [Line Items]              
Proportionately consolidated non-controlled joint venture, ownership percentage     25.00%   25.00%    
Corporate Joint Venture | Joint Venture Civil Construction Project | Maximum              
Loss Contingencies [Line Items]              
Proportionately consolidated non-controlled joint venture, ownership percentage     50.00%   50.00%    
Corporate Joint Venture | Joint Venture, Pipeline Project              
Loss Contingencies [Line Items]              
Proportionately consolidated non-controlled joint venture, ownership percentage     49.00%   49.00%    
Number of joint ventures | project     1   1    
Contractual Joint Venture              
Loss Contingencies [Line Items]              
Payments for project financing         $ 500,000    
Captive Insurance Company              
Loss Contingencies [Line Items]              
Cash and cash equivalents     $ 900,000   900,000   1,100,000
Performance and Payment Bonds              
Loss Contingencies [Line Items]              
Bonded projects, estimated costs to complete     1,789,700,000   1,789,700,000   1,739,900,000
Commercial and/or Financial Standby | Workers' Compensation, General and Automobile Policies | Self-Insurance              
Loss Contingencies [Line Items]              
Line of credit facility, letters of credit issued     56,400,000   56,400,000   95,600,000
Surety Bonds | Workers' Compensation | Self-Insurance              
Loss Contingencies [Line Items]              
Guarantor obligations, maximum exposure, undiscounted     148,600,000   148,600,000   110,900,000
Subsidiaries | Performance and Payment Bonds              
Loss Contingencies [Line Items]              
Guarantor obligations, maximum exposure, undiscounted     5,389,200,000   5,389,200,000   4,855,500,000
Subsidiaries | Performance and Payment Bonds | Corporate Joint Venture              
Loss Contingencies [Line Items]              
Guarantor obligations, maximum exposure, undiscounted     $ 357,900,000   $ 357,900,000   115,800,000
Revenue Benchmark | Customer Concentration Risk | Ten Largest Customers              
Loss Contingencies [Line Items]              
Concentration risk, percentage of total     35.00% 42.00% 36.00% 43.00%  
Infrastructure Energy Alternatives, Inc. | Commitments And Contingencies Concentration Risk              
Loss Contingencies [Line Items]              
Attorney fee percentage 0.45            
Silicon Ranch Corporation, LLC | Litigation Settlement, Benchmark | Commitments And Contingencies Concentration Risk              
Loss Contingencies [Line Items]              
Concentration risk, percentage of total 30.00%            
IEA | Pension              
Loss Contingencies [Line Items]              
Multiemployer plans, withdrawal obligation, monthly payment amount     $ 10,000        
Withdrawal liability     $ 1,900,000   $ 1,900,000   $ 1,900,000
IEA | Litigation Settlement, Benchmark | Commitments And Contingencies Concentration Risk              
Loss Contingencies [Line Items]              
Concentration risk, percentage of total 40.00%            
IEA Constructors, LLC | Litigation Settlement, Benchmark | Commitments And Contingencies Concentration Risk              
Loss Contingencies [Line Items]              
Concentration risk, percentage of total 30.00%            
Silicon Ranch Corporation, LLC Matter              
Loss Contingencies [Line Items]              
Damages sought $ 1,000,000            
Silicon Ranch Corporation, LLC Matter | H&L Farms              
Loss Contingencies [Line Items]              
Payments to acquire land   $ 3,300,000          
Silicon Ranch Corporation, LLC Matter | Infrastructure Energy Alternatives, Inc.              
Loss Contingencies [Line Items]              
Compensatory damages awarded to plaintiffs 4,500,000            
Remediation costs 1,500,000            
Silicon Ranch Corporation, LLC Matter | Silicon Ranch Corporation, LLC              
Loss Contingencies [Line Items]              
Punitive damages 25,000,000            
Silicon Ranch Corporation, LLC Matter | Infrastructure Energy Alternatives, Inc. And IEA Constructors, LLC              
Loss Contingencies [Line Items]              
Punitive damages 50,000,000            
Reduction in punitive damages $ 250,000