Legal Proceedings (Details) (USD $)	3 Months Ended
Mar. 31, 2013
Legal Proceedings [Abstract]
Settlement Award Received	$ 180,650,000
Federal taxes paid	501,000
Tax gross-up receivable from the United States	501,000
Incentive payment paid per Employment Agreement	$ 13,600,000

Gross-up receivable at December 31, 2012 for federal alternative minimum tax accrued at December 31, 2012, paid in March 2013, pursuant to Settlement Agreement.

No definition available.

Name:	abcp_TaxGrossUpReceivableFromUnitedStates
Namespace Prefix:	abcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant