Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement Of Partners Capital [Abstract]
Net income (loss)	$ 18,091	$ (41,737)	$ 13,710	$ (72,741)
Other comprehensive income (loss):
Change in foreign currency translation adjustment	20,490	(6,030)	37,479	(54,290)
Net change in unrealized gains (losses) on available-for-sale investments, net of tax	(27)	(7)	(8)	123
Other comprehensive income (loss), net of tax	20,463	(6,037)	37,471	(54,167)
Comprehensive income (loss):	$ 38,554	$ (47,774)	$ 51,181	$ (126,908)