Segment Reporting and Information about Geographic Areas - Schedule of Revenues by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 3,288,249	$ 2,984,675	$ 2,789,557	$ 2,696,270	$ 2,284,631	$ 2,298,436	$ 1,270,017	$ 1,147,048	$ 11,758,751	$ 7,000,132	$ 4,046,025
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									6,221,439	4,200,706
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									2,027,062	1,065,255
Norway [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									823,081	335,572
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 2,687,169	$ 1,398,599