Revisions in Estimates - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Change In Accounting Estimate [Line Items]
Total revenue	$ 789,540	$ 807,119	$ 1,409,341	$ 1,370,498
Gross profit (loss)	(52,404)	80,369	(11,926)	136,652
Net income (loss)	(97,836)	(8,385)	(132,410)	(19,808)
Change in project profitability from revisions in estimates	5,000	5,000	5,000	5,000
Decrease to project profitability	161,100	30,200	167,800	38,000
Transportation [Member]
Change In Accounting Estimate [Line Items]
Total revenue	403,978	502,711	742,188	861,856
Revisions in Estimates [Member]
Change In Accounting Estimate [Line Items]
Net income (loss)	$ (120,200)	$ (23,200)	$ (125,400)	$ (29,100)
Decrease to project profitability, per share	$ (2.57)	$ (0.57)	$ (2.68)	$ (0.73)
Revisions in Estimates [Member] | Transportation [Member]
Change In Accounting Estimate [Line Items]
Total revenue	$ (4,300)
Gross profit (loss)	(4,300)
Net income (loss)	$ (3,200)		$ (3,200)