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EARNINGS PER SHARE (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Computation of basic and diluted gain (loss) per share |  |  |
Net income (loss) attributable to Canadian Solar Inc.-basic (in dollars) | $ 239,501,317 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 31,659,276 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (195,468,691)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Dilutive effect of convertible notes interest | 4,641,363 us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther |  |
Net income attributable to Canadian Solar Inc. - diluted | $ 244,142,680 us-gaap_NetIncomeLossAttributableToParentDiluted | $ 31,659,276 us-gaap_NetIncomeLossAttributableToParentDiluted | $ (195,468,691)us-gaap_NetIncomeLossAttributableToParentDiluted
Weighted average number of common shares-basic | 54,408,037 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 46,306,739 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 43,190,778 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted effects of share number from share options and RSUs | 2,051,601 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 4,081,545 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
Dilutive effects of share number from convertible notes | 2,894,977 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities |  |
Weighted average number of common shares - diluted | 59,354,615 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 50,388,284 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 43,190,778 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings (loss) per share (in dollars per share) | $ 4.40 us-gaap_EarningsPerShareBasic | $ 0.68 us-gaap_EarningsPerShareBasic | $ (4.53)us-gaap_EarningsPerShareBasic
Diluted earnings (loss) per share (in dollars per share) | $ 4.11 us-gaap_EarningsPerShareDiluted | $ 0.63 us-gaap_EarningsPerShareDiluted | $ (4.53)us-gaap_EarningsPerShareDiluted
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share |  |  |
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share, total | 95,422 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 434,529 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 8,561,110 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Share options and RSUs |  |  |
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share |  |  |
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share, total | 95,422 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = csiq_StockOptionsAndRestrictedStockUnitsMember | 434,529 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = csiq_StockOptionsAndRestrictedStockUnitsMember | 4,288,008 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = csiq_StockOptionsAndRestrictedStockUnitsMember
Warrant |  |  |
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share |  |  |
Anti-dilutive shares excluded from the computation of diluted earnings (loss) per share, total |  |  | 4,273,102 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember

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