Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Currency translation adjustment, tax	$ 827	$ 41	$ 261
Net unrealized (gain) loss on derivatives-net of tax		$ (132)	$ 204