Condensed Consolidated Statements of Comprehensive Income (Loss) Parenthetical - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Change in unrealized foreign currency translation losses, income tax expense (benefit)	$ (171)	$ (131)	$ (366)	$ (139)