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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Revenue recognition (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Electricity |  |  |
Revenue recognition: |  |  |
Amount of performance based energy incentives | $ 9,402 | $ 6,628 | $ 3,915

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- Definition The amount of performance based energy incentives recognized in revenue. + References No definition available. + Details
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Namespace Prefix: | csiq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ElectricityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |