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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue Recognition [Line Items]
Remaining performance obligation		$ 3,990,000	$ 5,300,000
Revenues recognized related to change orders and claims		$ 141,200	$ 170,000
Change in contract estimates, favorable (unfavorable) impact on operating results, percent (less than)		5.00%	5.00%	5.00%
Percent of total revenues recognized associated with revenue recognition method		47.90%	50.00%	57.70%
Change in contract estimates, favorable (unfavorable) impact on revenues		$ 27,000
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period		491,500
Allowances for doubtful accounts on current receivables		16,546	$ 9,398
Long-term accounts receivable, net		13,367	12,427
Current retainage balances		306,300	299,600
Non-current retainage balances		88,200	54,200
Unbilled receivables		472,300	524,300	$ 434,900
Unearned revenues		53,562	33,192
Accounts Payable and Accrued Expenses
Revenue Recognition [Line Items]
Unearned revenues		53,600	33,200	40,100
Two Larger Pipleline Projects - Canada
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results		10,000
Larger Electric Transmission Project
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results		(20,800)
Several Projects
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results		35,500
EPC Electric Transmission Project
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results	$ (30,100)			(52,200)
Larger Pipeline Transmission Project
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results			(22,900)
Larger Natural Gas Transmission Project
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results			(16,200)
Electric Transmission Project - Southern California
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results			21,100
Contract value		$ 407,000
Percentage of project completion		95.00%
Peru Telecommunications Project | Correction of Total Estimated Project Costs | Restatement Adjustment
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results			9,600
Processing Facility Project
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results			$ 29,400	34,200
Electric Power Project
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results				22,300
$50 Million Lump Sum Natural Gas Pipeline Construction Project
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results				$ 17,300

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