Legal Proceedings (Details)	Nov. 22, 2021 Motions Defendant
Legal Proceedings [Abstract]
Number of defendant groups \| Defendant	4
Number of separate motions filed to dismiss claims \| Motions	4

The number of separate motions filed to dismiss claims.

No definition available.

Name:	abcp_LossContingencyNumberOfSeparateMotionsFiledToDismissClaims
Namespace Prefix:	abcp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration