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RESTRICTED NET ASSETS (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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RESTRICTED NET ASSETS |  |
Minimum percentage of the profit after tax to be appropriated to the general reserve | 10.00% |
Restricted net assets | $ 568,931 | $ 568,931,000

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- Definition Represents the minimum percentage of after tax profit required to be appropriated to the general reserve under PRC GAAP. + References No definition available. + Details
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Namespace Prefix: | csiq_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
Name: | us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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