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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
EMPLOYEE BENEFIT PLANS
Employer's contribution (as a percent)	20.00%
Defined contributions schemes expense	$ 12,544	$ 9,412	$ 7,186
Percentage of applicable salaries contributed by the employer for medical insurance benefits	10.00%
Percentage of applicable salaries contributed by the employer for housing funds	8.00%
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	$ 11,211	$ 10,447	$ 9,128

X

- 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

Name:	csiq_DefinedContributionPlanEmployerContributionAmount
Namespace Prefix:	csiq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the percentage of employees' applicable salaries for which the employer contributes to the housing funds of a defined contribution plan.

+ References

No definition available.

+ Details

Name:	csiq_DefinedContributionPlanEmployerContributionAsPercentageOfApplicableSalariesForHousingFunds
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 medical insurance benefits of a defined contribution plan.

+ References

No definition available.

+ Details

Name:	csiq_DefinedContributionPlanEmployerContributionAsPercentageOfApplicableSalariesForMedicalInsuranceBenefits
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

Name:	csiq_DefinedContributionPlanEmployerContributionAsPercentageOfApplicableSalariesForOtherStatutoryBenefits
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

Name:	csiq_DefinedContributionPlanEmployerContributionAsPercentageOfApplicableSalariesForUnemploymentBenefits
Namespace Prefix:	csiq_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ 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
Period Type:	duration