Revenue Recognition - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018 USD ($) Project		Mar. 31, 2017 USD ($)	Jan. 01, 2018 USD ($)
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Remaining performance obligations	$ 3,386,673,000	[1]		$ 3,673,317,000
Unapproved change orders	110,000,000		$ 118,000,000
Unapproved change orders in RPOs	8,000,000		12,000,000
Revenues	$ 607,818,000		519,431,000
Number of projects accounted under deferred profit recognition policy | Project	0
Claims Revenue [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Revenues	$ 0
MEA [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Remaining performance obligations	2,021,000,000
MEA [Member] | Unconsolidated joint ventures [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Revenues	0		0
MEA [Member] | Claims Revenue [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Revenues	$ 10,000,000		$ 10,000,000

[1] At March 31, 2018, approximately 48% of our RPOs were attributable to Saudi Aramco