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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Revenue Recognition [Line Items]
Revenues recognized related to change orders and claims	$ 150,400		$ 150,400		$ 121,800
Change in contract estimates, favorable (unfavorable) impact on operating results, percent (less than 5% for nine months ended September 30, 2019 and 2018)	6.20%	7.20%	5.00%	5.00%
Change in contract estimates, favorable (unfavorable) impact on operating results, amount	$ 29,200	$ 30,700
Percent of total revenues recognized associated with revenue recognition method	51.30%	58.60%	50.80%	56.00%
Revenue, related to performance obligation satisfied in previous periods			$ 28,400
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period			359,000
Allowances for doubtful accounts on current receivables	$ 7,683		7,683		5,839
Long-term accounts receivable	55,600		55,600		25,900
Unbilled receivables	732,700		732,700		434,900
Termination of the Peru Telecommunications Project
Revenue Recognition [Line Items]
Contract asset impairment			29,400
Accounts Receivable
Revenue Recognition [Line Items]
Current retainage balances	486,500		486,500		337,100
Other Assets
Revenue Recognition [Line Items]
Non-current retainage balances	39,900		39,900		99,600
Accounts Payable and Accrued Expenses
Revenue Recognition [Line Items]
Unearned revenues	39,600		39,600		$ 40,100
PG&E
Revenue Recognition [Line Items]
Long-term accounts receivable	43,000		43,000
Larger Pipeline Transmission Project
Revenue Recognition [Line Items]
Change in contract estimates, favorable (unfavorable) impact on operating results, amount	22,200		21,600
Electric Transmission Project - Southern California
Revenue Recognition [Line Items]
Change in contract estimates, favorable (unfavorable) impact on operating results, amount	(11,000)		(20,400)
Contract value	$ 400,000		$ 400,000
Percent of project completion	66.00%		66.00%
Processing Facility Project
Revenue Recognition [Line Items]
Change in contract estimates, favorable (unfavorable) impact on operating results, amount		$ (18,800)	$ (24,300)	$ (20,600)
Contract value	$ 141,000		$ 141,000
Percent of project completion	98.00%		98.00%
EPC Electric Transmission Project
Revenue Recognition [Line Items]
Change in contract estimates, favorable (unfavorable) impact on operating results, amount		47,100	$ 30,100	47,200
Natural Gas Pipeline Projects
Revenue Recognition [Line Items]
Change in contract estimates, favorable (unfavorable) impact on operating results, amount		(10,800)		(7,600)
Natural Gas Pipeline Construction Project
Revenue Recognition [Line Items]
Change in contract estimates, favorable (unfavorable) impact on operating results, amount		$ (6,200)		$ (16,400)

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