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INVESTMENTS IN AFFILIATES (Details 2) (USD $) | 12 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | May 23, 2012 item | Aug. 31, 2013 | Jul. 04, 2011 | Dec. 17, 2009 item | Sep. 25, 2012 | Sep. 27, 2012 | Dec. 31, 2014 | Sep. 30, 2012 | Jun. 30, 2013
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition of the entity | $ 72,034 us-gaap_PaymentsToAcquireEquityMethodInvestments | $ 4,278,361 us-gaap_PaymentsToAcquireEquityMethodInvestments | $ 3,428,751 us-gaap_PaymentsToAcquireEquityMethodInvestments |  |  |  |  |  |  |  |  |
Equity in earnings (loss) of unconsolidated investees | 487,346 csiq_IncomeLossFromEquityMethodInvestmentsNetOfTax | (3,064,006)csiq_IncomeLossFromEquityMethodInvestmentsNetOfTax | (1,969,306)csiq_IncomeLossFromEquityMethodInvestmentsNetOfTax |  |  |  |  |  |  |  |  |
Gaochuangte |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_SuzhouGaochuangteNewEnergyCoLtdMember | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_SuzhouGaochuangteNewEnergyCoLtdMember |  |  |  |  |  |  |  | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_SuzhouGaochuangteNewEnergyCoLtdMember |  |
GCL-CSI (Suzhou) Photovoltaic Technology Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest | 10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_GCLCSISuzhouPhotovoltaicTechnologyCoLtdMember | 10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_GCLCSISuzhouPhotovoltaicTechnologyCoLtdMember |  |  |  |  |  |  |  | 10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_GCLCSISuzhouPhotovoltaicTechnologyCoLtdMember |  |
CSI Skypower |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition of the entity |  |  |  | 3,428,751 us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_CSISkyPowerMember |  |  |  |  |  |  |  |
Percentage of ownership interest | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_CSISkyPowerMember | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_CSISkyPowerMember |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_CSISkyPowerMember |  |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_CSISkyPowerMember |  |
Number of board members designated by the acquired entity |  |  |  | 2 csiq_NumberOfBoardMembersDesignatedByTheAcquiredEntity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_CSISkyPowerMember |  |  |  |  |  |  |  |
Number of board members |  |  |  | 4 csiq_NumberOfBoardMembers / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_CSISkyPowerMember |  |  |  |  |  |  |  |
Additional capital contribution paid |  |  |  |  | 4,000,045 csiq_CapitalContributionsAmount / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_CSISkyPowerMember |  |  |  |  |  |  |
SZCC, or CSI Cells | Gaochuangte |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition of the entity |  |  |  |  |  |  | 2,929,020 us-gaap_PaymentsToAcquireEquityMethodInvestments / dei_LegalEntityAxis = csiq_CSICellsCoLtdMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_SuzhouGaochuangteNewEnergyCoLtdMember |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  |  | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = csiq_CSICellsCoLtdMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_SuzhouGaochuangteNewEnergyCoLtdMember |  |  |  |  |
Number of board members designated by the acquired entity |  |  |  |  |  |  | 1 csiq_NumberOfBoardMembersDesignatedByTheAcquiredEntity / dei_LegalEntityAxis = csiq_CSICellsCoLtdMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_SuzhouGaochuangteNewEnergyCoLtdMember |  |  |  |  |
Number of board members |  |  |  |  |  |  | 3 csiq_NumberOfBoardMembers / dei_LegalEntityAxis = csiq_CSICellsCoLtdMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_SuzhouGaochuangteNewEnergyCoLtdMember |  |  |  |  |
Additional capital contribution paid |  |  |  |  |  | 3,118,800 csiq_CapitalContributionsAmount / dei_LegalEntityAxis = csiq_CSICellsCoLtdMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_SuzhouGaochuangteNewEnergyCoLtdMember |  |  |  |  |  |
SZSP | GCL-CSI (Suzhou) Photovoltaic Technology Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition of the entity |  |  |  |  |  | 2,548,827 us-gaap_PaymentsToAcquireEquityMethodInvestments / dei_LegalEntityAxis = csiq_CSISolarPowerChinaIncMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_GCLCSISuzhouPhotovoltaicTechnologyCoLtdMember |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  | 10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = csiq_CSISolarPowerChinaIncMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_GCLCSISuzhouPhotovoltaicTechnologyCoLtdMember |  |  |  |  |  |
USPH | 9 utility-scale solar power projects |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition of the entity |  |  |  |  |  |  |  | 2,122,225 us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1 / dei_LegalEntityAxis = csiq_CSIProjectHoldcoLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_NineSoltasSolarPowerProjectsMember |  |  |  |
Percentage of ownership interest |  |  |  |  |  |  |  | 21.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = csiq_CSIProjectHoldcoLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_NineSoltasSolarPowerProjectsMember |  |  |  |
USPH | 2 separate utility-scale solar power projects |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition of the entity |  |  |  |  |  |  |  |  | 2,204,008 us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1 / dei_LegalEntityAxis = csiq_CSIProjectHoldcoLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_TwoSoltasSolarPowerProjectsMember |  |  |
Percentage of ownership interest | 5.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = csiq_CSIProjectHoldcoLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_TwoSoltasSolarPowerProjectsMember |  |  |  |  |  |  |  |  | 5.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = csiq_CSIProjectHoldcoLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_TwoSoltasSolarPowerProjectsMember |  |
Percentage of interest sold |  |  |  |  |  |  |  |  |  | 95.00%csiq_EquityMethodInvestmentOwnershipPercentageSold / dei_LegalEntityAxis = csiq_CSIProjectHoldcoLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_TwoSoltasSolarPowerProjectsMember |  |
USPH | First utility - scale solar power project |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  |  |  |  | 30.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = csiq_CSIProjectHoldcoLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_CESSterlingLLCMember |  |  |
USPH | Second utility - scale solar power project |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  |  |  |  | 28.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = csiq_CSIProjectHoldcoLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_BerkleyEastSolarLLCMember |  |  |
USPH | 12 and 3 separate utility-scale solar power projects |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for acquisition of the entity |  |  |  |  |  |  |  |  |  |  | 11,548,614 us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1 / dei_LegalEntityAxis = csiq_CSIProjectHoldcoLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_TwelveAndThreeSoltasSolarPowerProjectsMember |
USPH | 12 separate utility-scale solar power projects |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  |  |  |  |  |  | 21.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = csiq_CSIProjectHoldcoLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_TwelveSoltasSolarPowerProjectsMember |
USPH | 3 separate utility-scale solar power projects |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest |  |  |  |  |  |  |  |  |  |  | 30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = csiq_CSIProjectHoldcoLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_ThreeSoltasSolarPowerProjectsMember |
USPH | 5 solar power projects |  |  |  |  |  |  |  |  |  |  |  |
Investments in affiliates |  |  |  |  |  |  |  |  |  |  |  |
Additional capital contribution paid |  |  |  |  |  |  |  |  |  |  |  | $ 5,791,202 csiq_CapitalContributionsAmount / dei_LegalEntityAxis = csiq_CSIProjectHoldcoLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = csiq_FiveSolarPowerProjectsMember

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