Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income attributable to common stockholders	$ (619,376)	$ 21,878	$ (1,286,050)	$ (553,577)
Unrealized gain (loss) on derivatives:
Change in net unrealized gain		3,349		48,359
Less: Reclassification adjustment for net gains into net loss		(14,246)	(5,570)	(15,523)
Net unrealized (loss) gain on derivatives		(10,897)	(5,570)	32,836
Foreign currency translation adjustment	10,289	2,014	50,560	(3,970)
Other comprehensive income (loss)	10,289	(8,883)	44,990	28,866
Comprehensive (loss) income	$ (609,087)	$ 12,995	$ (1,241,060)	$ (524,711)