Revisions in Estimates - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change In Accounting Estimate [Line Items]
Decrease on project revenue and profitability	$ 4,900,000
Increase in net loss	1,600,000
Change in accounting estimate amount considered significant to individual project gross profit	5,000,000	$ 5,000,000	$ 6,500,000
Impact from affirmative claim recovery estimate	18,200,000	34,300,000	51,300,000
Net Estimate Change [Member]
Change In Accounting Estimate [Line Items]
Increase (decrease) on project profitability	(86,500,000)	(67,200,000)	(33,000,000)
Net Estimate Change [Member] | Specialty [Member]
Change In Accounting Estimate [Line Items]
Increase (decrease) on project profitability		(6,100,000)	(6,000,000)
Contracts Accounted for under Percentage of Completion [Member] | Noncontrolling Interest [Member]
Change In Accounting Estimate [Line Items]
Increase (decrease) on project profitability	$ 0	$ (2,100,000)	$ (6,500,000)