Commitments and Contingencies - Narrative (Details) $ in Thousands		1 Months Ended	3 Months Ended
	Apr. 28, 2023 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2023 USD ($) constructionProject customer	Mar. 31, 2022	Dec. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Line of credit facility, letters of credit issued			$ 162,900		$ 166,700
Number of joint ventures | constructionProject			4
Cash and cash equivalents			$ 141,560		370,592
Indemnities, accrued project close-out liabilities			$ 40,000		40,000
Number of customers | customer			995
Pension | IEA
Loss Contingencies [Line Items]
Withdrawal liability			$ 1,900		1,900
Workers' Compensation, General and Automobile Policies | Self-Insurance
Loss Contingencies [Line Items]
Self-insurance reserve			190,100		176,700
Workers' Compensation, General and Automobile Policies | Self-Insurance | Other Long-Term Liabilities
Loss Contingencies [Line Items]
Self-insurance reserve, non-current			118,800		109,300
Employee Group Medical Claims | Self-Insurance
Loss Contingencies [Line Items]
Self-insurance reserve			4,300		4,100
Corporate Joint Venture
Loss Contingencies [Line Items]
Cash and cash equivalents			$ 16,700		25,700
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%
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%
Corporate Joint Venture | Joint Venture Civil Construction Project | Minimum
Loss Contingencies [Line Items]
Proportionately consolidated non-controlled joint venture, ownership percentage			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%
Contractual Joint Venture
Loss Contingencies [Line Items]
Payments for project financing			$ 300
Captive Insurance Company
Loss Contingencies [Line Items]
Cash and cash equivalents			900		1,100
Performance and Payment Bonds
Loss Contingencies [Line Items]
Bonded projects, estimated costs to complete			1,942,200		1,739,900
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			95,600		95,600
Surety Bonds | Workers' Compensation | Self-Insurance
Loss Contingencies [Line Items]
Guarantor obligations, maximum exposure, undiscounted			110,900		110,900
Subsidiaries | Performance and Payment Bonds
Loss Contingencies [Line Items]
Guarantor obligations, maximum exposure, undiscounted			5,374,000		4,855,500
Subsidiaries | Performance and Payment Bonds | Corporate Joint Venture
Loss Contingencies [Line Items]
Guarantor obligations, maximum exposure, undiscounted			$ 254,500		$ 115,800
Revenue Benchmark | Customer Concentration Risk | Ten Largest Customers
Loss Contingencies [Line Items]
Concentration risk, percentage of total			39.00%	42.00%
Infrastructure Energy Alternatives, Inc. | Pension
Loss Contingencies [Line Items]
Multiemployer plans, withdrawal obligation, monthly payment amount			$ 10
Silicon Ranch Corporation, LLC | Subsequent Event | Litigation Settlement, Benchmark | Commitments And Contingencies Concentration Risk
Loss Contingencies [Line Items]
Concentration risk, percentage of total	30.00%
Infrastructure Energy Alternatives, Inc. And IEA Constructors, LLC | Subsequent Event | Litigation Settlement, Benchmark | Commitments And Contingencies Concentration Risk
Loss Contingencies [Line Items]
Concentration risk, percentage of total	70.00%
Silicon Ranch Corporation, LLC Matter | H&L Farms
Loss Contingencies [Line Items]
Payments to acquire land		$ 3,300
Silicon Ranch Corporation, LLC Matter | Infrastructure Energy Alternatives, Inc. | Subsequent Event
Loss Contingencies [Line Items]
Compensatory damages awarded to plaintiffs	$ 4,500
Remediation costs	1,500
Silicon Ranch Corporation, LLC Matter | Silicon Ranch Corporation, LLC | Subsequent Event
Loss Contingencies [Line Items]
Punitive damages	25,000
Silicon Ranch Corporation, LLC Matter | Infrastructure Energy Alternatives, Inc. And IEA Constructors, LLC | Subsequent Event
Loss Contingencies [Line Items]
Punitive damages	50,000
Silicon Ranch Corporation, LLC Matter | IEA Constructors, LLC | Subsequent Event
Loss Contingencies [Line Items]
Insurance policy limit	$ 10,000