Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (1,705)	$ 6,785	$ 7,061
Other comprehensive income (loss):
Foreign currency translation adjustments	7,141	(3,234)	(4,572)
Minimum pension liability, net of tax	469	(5,957)	2,206
Other comprehensive income (loss)	7,610	(9,191)	(2,366)
Comprehensive income (loss)	5,905	(2,406)	4,695
Less: Comprehensive loss attributed to noncontrolling interests	0	0	(35)
Comprehensive income (loss) attributable to CVG stockholders	$ 5,905	$ (2,406)	$ 4,730