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TAXATION - Valuation Allowance (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Movement of valuation allowance
Balance at beginning of the year	¥ 249,626	¥ 278,437	¥ 403,485
Allowance made during the year	66,346	96,336	7,315
Decrease due to disposal/deregistration of subsidiaries	(2,408)	(65,639)	(23,595)
Reversals	(15,875)	(59,508)	(108,768)
Balance at end of the year	¥ 297,689	¥ 249,626	¥ 278,437

X

- Definition

Amount of decrease in the valuation allowance due to disposal of subsidiaries.

+ References

No definition available.

+ Details

Name:	ambo_ValuationAllowanceDecreaseDueToDisposalOfSubsidiaries
Namespace Prefix:	ambo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of reversals in the period in the valuation allowance for a specified deferred tax asset.

+ References

No definition available.

+ Details

Name:	ambo_ValuationAllowanceDeferredTaxAssetReversals
Namespace Prefix:	ambo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

Name:	us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration