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LEASE - Total leases - Gross difference (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
LEASE |  |
Total future minimum lease payments | $ 54,123 |
Less: imputed interest | 1,430 |
NPV for future minimum lease payments | $ 52,693 | $ 78,559
Total future minimum lease payments |  | 82,851
Less: imputed interest |  | 4,292
NPV for future minimum lease payments |  | $ 78,559

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- Definition Lease Liability + References No definition available. + Details
Name: | csiq_LeaseLiability
Namespace Prefix: | csiq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of minimum lease payments for leases. + References No definition available. + Details
Name: | csiq_LeasesFutureMinimumLeasePaymentsDue
Namespace Prefix: | csiq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount necessary to reduce net minimum lease payments to present value for leases. + References No definition available. + Details
Name: | csiq_LeasesFutureMinimumPaymentsInterestIncludedInPayments
Namespace Prefix: | csiq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Present value of minimum lease payments for leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes. + References No definition available. + Details
Name: | csiq_LeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
Namespace Prefix: | csiq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee, Liability, Payments, Due + References No definition available. + Details
Name: | csiq_LesseeLiabilityPaymentsDue
Namespace Prefix: | csiq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, Liability, Undiscounted Excess Amount + References No definition available. + Details
Name: | csiq_LesseeLiabilityUndiscountedExcessAmount
Namespace Prefix: | csiq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration