v2.4.0.8

Significant Concentrations - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Airxcel, Inc. |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of purchases from major suppliers | 25.00% | 22.00% | 20.00%
Zhejiang |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of purchases from major suppliers |  | 6.00% | 6.00%
Zhejiang | Maximum |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of purchases from major suppliers | 5.00% |  |

X
- Definition Percentage of Purchases from Major Suppliers + References No definition available. + Details
Name: | crv_PercentageOfPurchasesFromMajorSuppliers
Namespace Prefix: | crv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration