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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2020	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2019
Revenue Recognition [Line Items]
Revenues recognized related to change orders and claims		$ 141,600			$ 170,000
Change in contract estimates, favorable (unfavorable) impact on operating results, amount		$ 24,100
Change in contract estimates, favorable (unfavorable) impact on operating results, percent (less than)			7.30%	5.00%
Percent of total revenues recognized associated with revenue recognition method		48.10%		51.70%
Change in recognized revenue related to change orders and claims		$ (28,400)
Revenue, related to performance obligation satisfied in previous periods		36,000
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period		268,700
Reduction to retained earnings upon adoption of accounting standard	$ 3,841
Allowances for doubtful accounts on current receivables		14,446			9,398
Deferred income tax provision		4,210		$ 24,558
Charges to bad debt expense		(273)		(2,823)
Long-term accounts receivable		12,100			12,600
Current retainage balances		313,200			299,600
Non-current retainage balances		57,400			54,200
Unbilled receivables		563,300			524,300
Accounts Payable and Accrued Expenses
Revenue Recognition [Line Items]
Unearned revenues		22,600			$ 33,200
Adjustment due to Adoption of New ASU
Revenue Recognition [Line Items]
Reduction to retained earnings upon adoption of accounting standard	3,800
Allowances for doubtful accounts on current receivables	5,100
Deferred income tax provision	$ 1,200
Larger Pipeline Transmission Project
Revenue Recognition [Line Items]
Change in contract estimates, favorable (unfavorable) impact on operating results, amount		11,600
Contract value		$ 95,100
Percentage of project completion		93.00%
EPC Electric Transmission Project
Revenue Recognition [Line Items]
Change in contract estimates, favorable (unfavorable) impact on operating results, amount				$ 25,500

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