CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (92,184)	$ (85,866)	$ (155,723)	$ (156,369)
Other comprehensive income, net of taxes of $0 for all periods:
Foreign currency translation adjustment	1,939	469	2,988	7,147
Total comprehensive loss	$ (90,245)	$ (85,397)	$ (152,735)	$ (149,222)