CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (31,784)	$ (68,093)	$ (52,511)
Other comprehensive income (loss):
Unrealized gain (loss) on derivative financial instruments, net	1,903	(5,143)	(3,915)
Reclassification of cash flow hedges upon derecognition		236
Reclassification of cash flow hedges due to ineffectiveness	(18)	33
Unrealized gain (loss) on derivative financial instruments of equity method investments	(1)	(9)	10
Total other comprehensive income (loss)	1,884	(4,883)	(3,905)
Comprehensive loss	(29,900)	(72,976)	(56,416)
Less: Comprehensive loss attributable to noncontrolling interest	(117)	(38)
Comprehensive loss attributable to common stockholders	$ (29,783)	$ (72,938)	$ (56,416)