Segment Reporting and Information about Geographic Areas - Schedule of Revenues by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 2,984,675	$ 2,298,436	$ 8,470,502	$ 4,715,501
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	1,582,143	1,432,456	4,380,393	2,891,419
China [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	563,561	314,941	1,531,082	567,357
Norway [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	225,461	135,200	482,965	236,009
Other [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues	$ 613,510	$ 415,839	$ 2,076,062	$ 1,020,716