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GAIN FROM DEREGISTRATION OF SUBSIDIARIES (Narrative) (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)
Gain from deregistration of subsidiaries	¥ 2,858	$ 416	¥ 0	¥ 0

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- Definition

Gain from deregistration of subsidiaries.

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No definition available.

+ Details

Name:	amboy_GainFromDeregistrationOfSubsidiaries
Namespace Prefix:	amboy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration