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Related Party Transactions (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Managment and Development Agreement [Abstract] |  |  |
Property Management Fee agreement | Management and Development Agreements Effective December 1, 2012, as a result of the sale of the Kings Plaza Regional Shopping Center (“Kings Plaza”) (see Note 4 – Discontinued Operations), the management and development agreement with Vornado was amended. Pursuant to the amended agreement, we pay Vornado an annual management fee equal to the sum of (i) $2,800,000, (ii) 2% of gross revenue from the Rego Park II shopping center, (iii) $0.50 per square foot of the tenant-occupied office and retail space at 731 Lexington Avenue, and (iv) $264,000, escalating at 3% per annum, for managing the common area of 731 Lexington Avenue. In addition, Vornado is entitled to a development fee of 6% of development costs, as defined. |  |
Leasing Agreement [Abstract] |  |  |
Leasing service fee payable, description | Vornado also provides us with leasing services for a fee of 3% of rent for the first ten years of a lease term, 2% of rent for the eleventh through the twentieth year of a lease term, and 1% of rent for the twenty-first through thirtieth year of a lease term, subject to the payment of rents by tenants. In the event third-party real estate brokers are used, the fees to Vornado increase by 1% and Vornado is responsible for the fees to the third-party real estate brokers. |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR |  |
Kings Plaza Regional Shopping Center [Member] |  |  |
Leasing Agreement [Abstract] |  |  |
Kings Plaza sales commission | $ 7,510,000 |  |
Summary of fees to Vornado |  |  |
Property management and leasing fees to Vornado related to Kings Plaza | 2,261,000 | 3,385,000 | 1,758,000
Mr. Roth, David Mandelbaum, and Russell B. Wight, Jr. |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership Interest in the Company | 26.30% |  |
IP & Partners Through Vornado |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership Interest in the Company | 2.10% |  |
Vornado [member] |  |  |
Related Party Transaction [Line Items] |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 32.40% |  |
Managment and Development Agreement [Abstract] |  |  |
Management Fee Agreement Value | 2,800,000 |  |
Leasing Agreement [Abstract] |  |  |
Percentage Commissions On Sale Of Assets Under Fifty Million | 3.00% |  |
Percentage Commissions On Sale Of Assets Over Fifty Million | 1.00% |  |
Leasing services fee and commission on asset sale, annual installment, maximum. | 4,000,000 |  |
Basis spread over LIBOR | 1.00% |  |
Unpaid Balance Effective Interest | 2.13% |  |
Other Agreements [Abstract] |  |  |
Other Supervisory Fees | 6.00% |  |
Summary of fees to Vornado |  |  |
Total | 18,251,000 | 12,870,000 | 12,336,000
Vornado [member] | Lexington Avenue Property [Member] | Office And Retail Space [Member] |  |  |
Managment and Development Agreement [Abstract] |  |  |
Property Management Fee Agreement Price Per Square Foot | 0.5 |  |
Vornado [member] | Lexington Avenue Property [Member] | Common Area [Member] |  |  |
Managment and Development Agreement [Abstract] |  |  |
Property Management Fee Agreement Value | 264,000 |  |
Property Management Fee Escalation Percentage Per Annum | 3.00% |  |
Vornado [member] | Rego Park 2 Property [Member] |  |  |
Managment and Development Agreement [Abstract] |  |  |
Property Management Fee Agreement Percentage Of Income | 2.00% |  |
Vornado [member] | Company Management Fees [Member] |  |  |
Summary of fees to Vornado |  |  |
Total | 2,983,000 | 3,000,000 | 3,000,000
Vornado [member] | Development fees [Member] |  |  |
Managment and Development Agreement [Abstract] |  |  |
Development fee as percentage of development costs | 6.00% |  |
Summary of fees to Vornado |  |  |
Total | 438,000 | 750,000 | 727,000
Vornado [member] | Leasing Fees [Member] |  |  |
Leasing Agreement [Abstract] |  |  |
Lease Fee Percentage Of Rent One To Ten Years | 3.00% |  |
Lease Fee Percentage Of Rent Eleven To Twenty Years | 2.00% |  |
Lease Fee Percentage Of Rent Twenty First To Thirty Years | 1.00% |  |
Percentage Increase Lease Fee If Broker Used | 1.00% |  |
Summary of fees to Vornado |  |  |
Total | 2,217,000 | 4,472,000 | 4,267,000
Fees owed to Vornado | 45,803,000 |  |
Vornado [member] | Property Management Fees [Member] |  |  |
Summary of fees to Vornado |  |  |
Total | 5,103,000 | 4,648,000 | 4,342,000
Fees owed to Vornado | $ 642,000 |  |

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