| **Investment in 111 West 57th Partners LLC (Details) $ in Thousands**                                                    |          |           | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 12 Months Ended |         |          |
|--------------------------------------------------------------------------------------------------------------------------|----------|-----------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|---------|----------|
||
| **Schedule of Equity Method Investments [Line Items]**                                                                   |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| Company's aggregate initial investment                                                                                   |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   | $ 57,250 |
| Company's aggregate initial membership interest %                                                                        |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   | 60.30% |
| Other members and Sponsor initial investment                                                                             |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   | $ 37,750 |
| Approximate gross square feet of project | ft2                                                                      |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   | 346,000 |
| Description of partnership agreement distribution                                                                        |     |      | The JV Agreement and related operating agreements generally provide that all distributable cash shall be distributed as follows: (i) first, 100% to the members in proportion to their percentage interests until Investment LLC has received distributions yielding a 20% internal rate of return as calculated; (ii) second, 100% to the Sponsor as a return of (but not a return on) any additional capital contributions made by the Sponsor on account of manager overruns; and (iii) thereafter, (a) 50% to the members in proportion to their respective percentage interests at the time of such distribution, and (b) 50% to the Sponsor. |            |    |     |   |   |
| Subordinated participation interest to CEO                                                                               |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            | 10.00%  |     |   |   |
| Percentage of distribution on company's initial investment to be received prior to CEO receiving percentage distribution |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            | 150.00% |     |   |   |
| Annaly CRE LLC initial mortgage and acquisition loan repaid                                                              |     | $ 230,000 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| Valuation of shortfall capital contribution as multiple of amount actually contributed                                   |     |      | 1.5                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |            |    |     |   |   |
| Sponsor calculation of investment LLC aggregate investment percentage after dilution                                     |     |      | 48.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |            |    |     |   |   |
| Term of loan                                                                                                             |     |      | 4 years                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |            |    |     |   |   |
| Extension option of loan                                                                                                 |     |      | 1 year                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |            |    |     |   |   |
| Impairment on the Company's equity method investments                                                                    |     |      | $ 0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | $ 0             |    | $ 63,745 |   |   |
| **Income (Loss) [Abstract]**                                                                                             |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| Rental income                                                                                                            |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 0               |    |     |   |   |
| Expenses                                                                                                                 |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 31              |    |     |   |   |
| Net income (loss)                                                                                                        |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | (31)            |    |     |   |   |
| Line of Credit [Member] | R. A. Bianco [Member]                                                                          |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                                   |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| Maximum borrowing capacity                                                                                               |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | $ 10,000        |    |     | $ 1,000 |   |
| Minimum [Member]                                                                                                         |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                                   |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| Additional borrowing required to complete project                                                                        |     |      | 60,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |            |    |     |   |   |
| Maximum [Member]                                                                                                         |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                                   |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| Additional borrowing required to complete project                                                                        |     |      | $ 100,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |            |    |     |   |   |
| Capital LLC [Member]                                                                                                     |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                                   |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| Percentage of outstanding shares to be owned by CEO                                                                      |     |      | 20.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |            |    |     |   |   |
| Investment LLC [Member] | Capital LLC [Member]                                                                           |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                                   |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| Terms of distributions to Capital LLC                                                                                    |     |      | available cash of Investment LLC will be distributed first to Capital LLC until it has received a 20% internal rate of return (calculated as provided for in the JV Agreement as noted above), second to the Company until it has received 150% of its capital, and, thereafter, available cash is split 10/90, with 10% going to Mr. R. A. Bianco as the subordinated participation interest noted above and 90% going to Capital LLC and the Company pari-passu, with Capital LLC receiving one-half of its pro-rata share based on capital contributed and the Company receiving the balance.                                                   |            |    |     |   |   |
| AIG [Member]                                                                                                             |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                                   |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| Financing obtained by 111 W 57th Partners                                                                                |     | 400,000   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| Apollo [Member]                                                                                                          |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                                   |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| Financing obtained by 111 W 57th Partners                                                                                |     | $ 325,000 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| Junior Mezzanine Loan [Member]                                                                                           |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| **Schedule of Equity Method Investments [Line Items]**                                                                   |     |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |
| Junior mezzanine loan sold by lender to an affiliate of Spruce Capital Partners LLC                                      | $ 25,000 |      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |    |     |   |   |

| X                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of additional borrowings needed to complete the project as a result of projected Proposed Budget increase.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                    |
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| - Definition
The amount of additional contributions made by other partners in the equity method investment agreement.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                           |
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| - Definition
Refers to additional debt sold by a lender to a third-party investor.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                  |
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| - Definition
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.
+ References
No definition available.
+ Details**Name:**abcp_DebtInstrumentExtensionOptionPeriod**Namespace Prefix:**abcp_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                   |
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| - Definition
A description of the distribution activities of an investee accounted for under the equity method.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
No definition available.
+ Details**Name:**abcp_FinancingObtainedForInvestmentPropertyByJointVenture**Namespace Prefix:**abcp_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the percentage of distribution on company's initial investment to be received prior to CEO receiving percentage distribution.
+ References
No definition available.
+ Details**Name:**abcp_PercentageOfDistributionOnCompanySInitialInvestmentToBeReceivedPriorToCEOReceivingPercentageDistribution**Namespace Prefix:**abcp_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The percentage of outstanding shares that should be owned by the CEO and, or his beneficiaries.
+ References
No definition available.
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| - Definition
Refers to the Sponsor calculation of aggregate investment percentage after dilution.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Participation interest assigned to the President and CEO of the company.
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| X                                                                                                                                                                                                                                                                                                       |
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| - Definition
A description of the terms of distributions to noncontrolling interests.
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| - Definition
Represents the value of shortfall capital contribution as multiple of amount actually contributed.
+ References
No definition available.
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| X                                                                                                                                                                                                                                          |
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| - Definition
Area of a real estate property.
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| - Definition
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.
+ References
No definition available.
+ Details**Name:**us-gaap_DebtInstrumentTerm**Namespace Prefix:**us-gaap_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the aggregate cost of investments accounted for under the equity method of accounting.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of the cost of sales reported by an equity method investment of the entity.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of gross profit (loss) reported by an equity method investment of the entity.
+ References
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| - References
No definition available.
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| - Definition
The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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