Revenue Recognition - Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Unapproved change orders		$ 98,000,000	$ 139,000,000	$ 98,000,000	$ 139,000,000
Revenues	[1]	958,531,000	558,543,000	2,266,635,000	1,994,202,000
MEA [Member] | Unconsolidated joint ventures [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Revenues		0	0	0	0
MEA [Member] | Claims Revenue [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Revenues				10,000,000	16,000,000
Backlog [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Unapproved change orders		$ 9,000,000	$ 21,000,000	9,000,000	$ 21,000,000
EPCI Project [Member] | MEA [Member] | KJO Hout Project [Member]
Revenue Recognition Multiple Deliverable Arrangements [Line Items]
Loss on contracts				$ 9,000,000

[1] Intersegment transactions included in revenues were not significant for all the periods presented.