Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Revenues	$ 755,231	$ 662,112	$ 825,341
Cost of revenues	662,666	574,882	714,519
Gross Profit	92,565	87,230	110,822
Selling, general and administrative expenses	59,800	60,542	71,469
Amortization expense	1,320	1,305	1,327
Operating Income	31,445	25,383	38,026
Other income	(1,349)	(769)	(152)
Interest expense	19,149	19,318	21,359
Income Before Provision for Income Taxes	13,645	6,834	16,819
Provision for income taxes	15,350	49	9,758
Net (loss) income	(1,705)	6,785	7,061
Less: Non-controlling interest in subsidiary’s income	0	0	1
Net (loss) income attributable to CVG	$ (1,705)	$ 6,785	$ 7,060
(Loss) earnings per common share
Basic (in dollars per share)	$ (0.06)	$ 0.23	$ 0.24
Diluted (in dollars per share)	$ (0.06)	$ 0.23	$ 0.24
Weighted average shares outstanding
Basic (in shares)	29,942	29,530	29,209
Diluted (in shares)	29,942	29,878	29,399