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COMMITMENTS AND CONTINGENCIES - Contingencies (Details) $ in Millions	12 Months Ended	36 Months Ended
	Dec. 31, 2010 item	Dec. 31, 2019 USD ($)
Class Action Lawsuits Filed in New York
Contingencies
Number of subpoenas	2
Number of lawsuits filed	6
Countervailing and anti-dumping duties investigation
Contingencies
Period of sunset reviews		5 years
First Administrative Review of Solar 2
Contingencies
Amount of provision reversed | $		$ 52.3

X

- Definition

Represents the amount of provision for loss contingency reversed.

+ References

No definition available.

+ Details

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Namespace Prefix:	csiq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the number of subpoenas received during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	csiq_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period covered by the sunset reviews conducted by USDOC and USITC, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	csiq_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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
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X

- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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