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Significant Concentrations - Additional Information (Detail)
 12 Months Ended
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