Income Taxes - Components of Domestic and Foreign (Loss) Income before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
United States	$ (1,467,184)	$ (718,416)	$ (272,603)
Noncontrolling interest and redeemable noncontrolling interests	710,492	319,196	95,968
Foreign	(8,804)	(2,746)	78
Total	$ (765,496)	$ (401,966)	$ (176,557)