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EMPLOYEE BENEFIT PLANS (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
EMPLOYEE BENEFIT PLANS |  |  |
Employer's contribution (as a percent) | 20.00% |  |
Defined contributions schemes expense | $ 5,880,203 | $ 3,825,278 | $ 2,116,173
Percentage of applicable salaries contributed by the employer for medical insurance benefits | 10.00% |  |
Percentage of applicable salaries contributed by the employer for unemployment benefits | 2.00% |  |
Percentage of applicable salaries contributed by the employer for other statutory benefits | 2.00% |  |
Amount of contribution by the employer for medical insurance benefits, housing funds, unemployment and other statutory benefits | $ 6,012,889 | $ 4,067,355 | $ 1,979,476

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- Definition Represents the amount of contributions made by an employer to the medical insurance benefits, housing funds, unemployment and other statutory benefits of a defined contribution plan. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the percentage of employees' applicable salaries for which the employer contributes to the medical insurance benefits of a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | csiq_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of employees' applicable salaries for which the employer contributes to the other statutory benefits of a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | csiq_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of employees' applicable salaries for which the employer contributes to the unemployment benefits of a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | csiq_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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