Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 414	$ 333	$ 2,515	$ 16,991
Other comprehensive income (loss)
Foreign currency translation adjustment	(823)	(11,833)	6,009	(32,718)
Comprehensive income (loss)	$ (409)	$ (11,500)	$ 8,524	$ (15,727)