Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement Of Partners Capital [Abstract]
Net income (loss)	$ 5,093	$ (4,446)	$ (4,381)	$ (31,004)
Other comprehensive income (loss):
Change in foreign currency translation adjustment	11,508	(30,931)	16,989	(48,260)
Net change on unrealized gains (losses) on available-for-sale investments, net of tax	(4)	(6)	19	130
Other comprehensive income (loss), net of tax	11,504	(30,937)	17,008	(48,130)
Comprehensive income (loss):	$ 16,597	$ (35,383)	$ 12,627	$ (79,134)