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ADDITIONAL INFORMATION - CONDENSED FINANCIAL STATEMENTS - Narrative (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2020	Dec. 31, 2019
PRC subsidiaries and VIEs [Member]
Condensed Financial Statements, Captions [Line Items]
Restricted Net Asset	¥ 517,713	¥ 601,547

X

- Definition

Total amount of restricted net asset of subsidiaries.

+ References

No definition available.

+ Details

Name:	ambo_RestrictedNetAsset
Namespace Prefix:	ambo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

Name:	srt_CondensedFinancialStatementsCaptionsLineItems
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=ambo_PrcSubsidiariesAndViesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: