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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Details 6) (Advances to suppliers, Supplier, USD $)
Dec. 31, 2014
Dec. 31, 2013
Supplier A
    
Concentration of credit risk    
Advances to suppliers $ 16,268,349csiq_AdvancesOnInventoryPurchasesCurrentAndNonCurrent
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= csiq_AdvancesToSuppliersMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= csiq_SupplierAMember		 $ 18,506,251csiq_AdvancesOnInventoryPurchasesCurrentAndNonCurrent
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= csiq_AdvancesToSuppliersMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= csiq_SupplierAMember
Supplier B
    
Concentration of credit risk    
Advances to suppliers 10,459,225csiq_AdvancesOnInventoryPurchasesCurrentAndNonCurrent
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= csiq_AdvancesToSuppliersMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= csiq_SupplierBMember		 10,497,138csiq_AdvancesOnInventoryPurchasesCurrentAndNonCurrent
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= csiq_AdvancesToSuppliersMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= csiq_SupplierBMember
Supplier C
    
Concentration of credit risk    
Advances to suppliers 9,804,708csiq_AdvancesOnInventoryPurchasesCurrentAndNonCurrent
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= csiq_AdvancesToSuppliersMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= csiq_SupplierCMember		 9,840,223csiq_AdvancesOnInventoryPurchasesCurrentAndNonCurrent
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= csiq_AdvancesToSuppliersMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= csiq_SupplierCMember
Supplier D
    
Concentration of credit risk    
Advances to suppliers $ 9,389,406csiq_AdvancesOnInventoryPurchasesCurrentAndNonCurrent
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= csiq_AdvancesToSuppliersMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= csiq_SupplierDMember		 $ 2,904,207csiq_AdvancesOnInventoryPurchasesCurrentAndNonCurrent
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= csiq_AdvancesToSuppliersMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_SupplierConcentrationRiskMember
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= csiq_SupplierDMember