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Revenue Recognition and Related Balance Sheet Accounts - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Customer	Dec. 31, 2021 USD ($) Customer	Dec. 31, 2020 USD ($) Customer
Revenue Recognition [Line Items]
Revenues recognized related to change orders and claims	$ 549,300	$ 367,800
Change in contract estimates, favorable (unfavorable) impact on revenue, percent	0.70%	1.00%	0.20%
Percent of total revenues recognized associated with revenue recognition method	51.60%	45.90%	47.90%
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period	$ 695,100	$ 433,300	$ 491,500
Current retainage balances	397,600	406,700
Non-current retainage balances	136,200	93,900
Unbilled receivables	$ 823,900	$ 679,000	$ 472,300
Customer Concentration Risk
Revenue Recognition [Line Items]
Number of customers representing ten percent or more of revenues | Customer	0	0	0
Accounts Receivable | Customer Concentration Risk | Renewable Energy Infrastructure Solutions
Revenue Recognition [Line Items]
Concentration risk, percentage	13.00%	11.00%
Accounts Receivable | Customer Concentration Risk | Electric Power Infrastructure Solutions and Renewable Energy Infrastructure Solutions
Revenue Recognition [Line Items]
Concentration risk, percentage		11.00%
Blattner
Revenue Recognition [Line Items]
Contract liabilities		$ 227,040
Limetree Bay Refining, LLC
Revenue Recognition [Line Items]
Write-offs charged against the allowance net of recoveries of amounts previously written off	$ 31,700
Accounts payable and accrued expenses
Revenue Recognition [Line Items]
Unearned revenues	$ 59,600	$ 51,800	$ 53,600
Two Larger Pipleline Projects - Canada
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results, amount			10,000
Larger Electric Transmission Project
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results, amount			(20,800)
Several Projects
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results, amount			$ 35,500
Projects In Progress
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results, percent	5.00%	(5.70%)	5.00%
Change in contract estimates, (favorable) unfavorable impact on operating results, amount		$ (111,500)

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