Name:	abcp_AdditionalInformationRegardingEquityInvestmentIn111West57thPropertyAbstract
Namespace Prefix:	abcp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of Annaly CRE, LLC mortgage and acquisition loan repaid simultaneously with the closing of the AIG and the Apollo financing, in full satisfaction of all outstanding liabilities and obligations to Annaly CRE.

No definition available.

Name:	abcp_AmountOfAcquisitionLoanRepaid
Namespace Prefix:	abcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Period of extension option of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	abcp_DebtInstrumentExtensionOptionPeriod
Namespace Prefix:	abcp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

A description of the distribution activities of an investee accounted for under the equity method.

No definition available.

Name:	abcp_EquityMethodInvestmentDescriptionOfDistribution
Namespace Prefix:	abcp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of financing obtained by 111 West 57th Partners for the 111 West 57th Street Real Estate Development Project, consisting of: (i) a first mortgage construction loan with AIG Asset Management (US), LLC; and (ii) a mezzanine loan with Apollo Commercial Real Estate Finance, Inc.

No definition available.

Name:	abcp_FinancingObtainedForInvestmentPropertyByJointVenture
Namespace Prefix:	abcp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

Name:	abcp_InformationRelatingToFinancingForInvestmentPropertyAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

This element represents the percentage of distribution on company's initial investment to be received prior to CEO receiving percentage distribution.

No definition available.

Name:	abcp_PercentageOfDistributionOnCompanySInitialInvestmentToBeReceivedPriorToCEOReceivingPercentageDistribution
Namespace Prefix:	abcp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The percentage of outstanding shares that should be owned by the CEO and, or his beneficiaries.

No definition available.

Name:	abcp_PercentageOfOutstandingSharesToBeOwnedByCEO
Namespace Prefix:	abcp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Refers to the Sponsor calculation of aggregate investment percentage after dilution.

No definition available.

Name:	abcp_SponsorCalculationOfAggregateInvestmentPercentageAfterDilution
Namespace Prefix:	abcp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Participation interest assigned to the President and CEO of the company.

No definition available.

Name:	abcp_SubordinatedParticipationInterestToCeo
Namespace Prefix:	abcp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

A description of the terms of distributions to noncontrolling interests.

No definition available.

Name:	abcp_TermsOfDistributionsToNoncontrollingInterests
Namespace Prefix:	abcp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the value of shortfall capital contribution as multiple of amount actually contributed.

No definition available.

Name:	abcp_ValuationOfShortfallCapitalContributionAsMultipleOfAmountActuallyContributed
Namespace Prefix:	abcp_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_ChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_NoncontrollingInterestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

Name:	us-gaap_DebtInstrumentAxis=abcp_FirstMortgageConstructionLoanWithAIGMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: