Income Taxes - Schedule of Loss Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Domestic	$ 993,113	$ 130,718	$ 415,694
Noncontrolling interest and redeemable noncontrolling interest	279,178	98,132
Foreign	936,741	517,498	459,930
Loss before income taxes	$ 2,209,032	$ 746,348	$ 875,624