Consolidated Statements Of Stockholders' Equity (Deficit) (USD $) In Thousands, except Share data	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Deficit	Accum. Other Comp. Loss	Total CVG Stockholders' Equity (Deficit)	Non- Controlling Interest
Beginning Balance at Dec. 31, 2010	$ (112)	$ 280	$ (2,851)	$ 215,491	$ (193,359)	$ (19,673)	$ (112)
Beginning Balance (in shares) at Dec. 31, 2010		27,756,759
Issuance of restricted stock (in shares)		555,832
Issuance of restricted stock	5	5					5
Surrender of common stock by employees (in shares)		(141,662)
Surrender of common stock by employees	(1,208)		(1,208)				(1,208)
Share-based compensation expense	3,621			3,621			3,621
Total comprehensive income (loss)	10,444				18,605	(8,145)	10,460	(16)
Non-controlling interests	25							25
Ending balance at Dec. 31, 2011	12,775	285	(4,059)	219,112	(174,754)	(27,818)	12,766	9
Ending balance (in shares) at Dec. 31, 2011		28,170,929
Issuance of restricted stock (in shares)		455,834
Issuance of restricted stock	5	5					5
Surrender of common stock by employees (in shares)		(163,284)
Surrender of common stock by employees	(1,205)		(1,205)				(1,205)
Share-based compensation expense	4,710			4,710			4,710
Total comprehensive income (loss)	50,001				50,077	(67)	50,010	(9)
Non-controlling interests	22							22
Ending balance at Dec. 31, 2012	66,308	290	(5,264)	223,822	(124,677)	(27,885)	66,286	22
Ending balance (in shares) at Dec. 31, 2012	28,463,479	28,463,479
Issuance of restricted stock (in shares)		495,758
Issuance of restricted stock	6	6					6
Surrender of common stock by employees (in shares)	(99,000)	(99,094)
Surrender of common stock by employees	(831)		(831)				(831)
Share-based compensation expense	5,315			5,315			5,315
Total comprehensive income (loss)	(10,879)				(12,445)	1,577	(10,868)	(11)
Non-controlling interests	22							22
Ending balance at Dec. 31, 2013	$ 59,941	$ 296	$ (6,095)	$ 229,137	$ (137,122)	$ (26,308)	$ 59,908	$ 33
Ending balance (in shares) at Dec. 31, 2013	28,860,143	28,860,143