Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss) attributable to common stockholders	$ 311,516	$ (619,376)	$ (1,115,574)	$ (1,286,050)
Unrealized gains (losses) on derivatives:
Reclassification adjustment for net losses into net loss				(5,570)
Foreign currency translation adjustment	(10,274)	10,289	(25,077)	50,560
Other comprehensive (loss) income	(10,274)	10,289	(25,077)	44,990
Comprehensive income (loss)	$ 301,242	$ (609,087)	$ (1,140,651)	$ (1,241,060)