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TAXATION - Uncertain Tax Positions (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of the beginning and ending amount of liabilities associated with uncertain tax positions
Unrecognized tax benefits, beginning of year	¥ 32,152	¥ 26,246	¥ 24,619
The amount of decreases in the unrecognized tax benefits relating to settlements with taxing authorities	(69)	(242)	(259)
Additions for tax position of current year	3,231	6,148	2,301
Decrease due to disposal of subsidiaries (Note 25)	(551)
Decrease due to deregistration of subsidiary			(415)
Unrecognized tax benefits, end of year	¥ 34,763	¥ 32,152	¥ 26,246

X

- Definition

Amount of decrease in unrecognized tax benefits resulting from Deregistration of subsidiaries.

+ References

No definition available.

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- Definition

Amount of decrease in unrecognized tax benefits resulting from disposal of interests in subsidiaries.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
-URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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- Definition

Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 15A
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