v2.4.1.9

Significant Concentrations - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Airxcel, Inc. |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of purchases from major suppliers | 23.00%crv_PercentageOfPurchasesFromMajorSuppliers / us-gaap_ConcentrationRiskByTypeAxis = crv_SupplierOneMember | 25.00%crv_PercentageOfPurchasesFromMajorSuppliers / us-gaap_ConcentrationRiskByTypeAxis = crv_SupplierOneMember | 22.00%crv_PercentageOfPurchasesFromMajorSuppliers / us-gaap_ConcentrationRiskByTypeAxis = crv_SupplierOneMember
Zhejiang |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of purchases from major suppliers |  |  | 6.00%crv_PercentageOfPurchasesFromMajorSuppliers / us-gaap_ConcentrationRiskByTypeAxis = crv_SupplierTwoMember
Zhejiang | Maximum |  |  |
Concentration Risk [Line Items] |  |  |
Percentage of purchases from major suppliers | 5.00%crv_PercentageOfPurchasesFromMajorSuppliers / us-gaap_ConcentrationRiskByTypeAxis = crv_SupplierTwoMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 5.00%crv_PercentageOfPurchasesFromMajorSuppliers / us-gaap_ConcentrationRiskByTypeAxis = crv_SupplierTwoMember / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- 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

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

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- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=crv_SupplierOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=crv_SupplierTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |