Information about Geographic Areas - Schedule of Revenues by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 1,214,379	$ 936,789	$ 954,976	$ 939,880	$ 956,661	$ 851,804	$ 769,349	$ 620,542	$ 4,046,025	$ 3,198,356	$ 2,013,496
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,957,397	1,471,643	1,479,166
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									318,513	477,082
Norway [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									356,419	412,198	217,070
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 1,413,696	$ 837,433	$ 317,260