Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (901)	$ 5,486	$ 4,862	$ 5,524
Other comprehensive income (loss), net of tax:
Interest rate swap	55	(115)	248	28
Foreign currency translation	(3,292)	1,763	(1,282)	2,169
Comprehensive (loss) income	$ (4,138)	$ 7,134	$ 3,828	$ 7,721