Income Taxes (Details) $ in Thousands	1 Months Ended
Mar. 31, 2013 USD ($)
Income Taxes [Abstract]
Paid federal income taxes attributable to alternative minimum tax rate	$ 501

Amount paid for federal income taxes attributable to AMT rate calculations (the "2012 AMT Amount") resulting from the SGW 2012 Settlement Agreement.

No definition available.

Name:	abcp_AmountPaidForFederalIncomeTaxesAttributableToAlternativeMinimumTaxRateResultingFromSGW2012SettlementAgreement
Namespace Prefix:	abcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration