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Relationship with Vornado (Details) (USD $) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Managment And Development Agreement [Abstract] |  |  |  |
Property Management Fee 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) $272,000, 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. |
Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 32.40% |  | 32.40% |
Managment And Development Agreement [Abstract] |  |  |  |
Management Fee Agreement Value (in US Dollars) |  |  | $ 2,800,000 |
Leasing Agreement [Abstract] |  |  |  |
Asset sale commission threshold (in US Dollars) |  |  | 50,000,000 |
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 (in US Dollars) |  |  | 4,000,000 |
Debt Instrument, Description of Variable Rate Basis |  |  | LIBOR |
Basis spread over LIBOR | 1.00% |  | 1.00% |
Unpaid Balance Effective Interest | 1.84% |  | 1.84% |
Other Agreements [Abstract] |  |  |  |
Other Supervisory Fees |  |  | 6.00% |
Fees to Related Party | 1,904,000 | 2,502,000 | 5,756,000 | 8,548,000
Affiliated Entity [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 |
Affiliated Entity [Member] | Lexington Avenue Property [Member] | Common Area [Member] |  |  |  |
Managment And Development Agreement [Abstract] |  |  |  |
Property Management Fee Agreement Value (in US Dollars) |  |  | 272,000 |
Property Management Fee Escalation Percentage Per Annum |  |  | 3.00% |
Affiliated Entity [Member] | Rego Park 2 Property [Member] |  |  |  |
Managment And Development Agreement [Abstract] |  |  |  |
Property Management Fee Agreement Percentage Of Gross Revenue |  |  | 2.00% |
Affiliated Entity [Member] | Development fees [Member] |  |  |  |
Managment And Development Agreement [Abstract] |  |  |  |
Development fee as percentage of development costs |  |  | 6.00% |
Other Agreements [Abstract] |  |  |  |
Fees to Related Party | 0 | 63,000 | 0 | 438,000
Affiliated Entity [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% |
Other Agreements [Abstract] |  |  |  |
Fees owed to Vornado | 43,708,000 |  | 43,708,000 |
Fees to Related Party | 225,000 | 320,000 | 903,000 | 1,949,000
Affiliated Entity [Member] | Property Management Fees And Leasing Fees [Member] |  |  |  |
Other Agreements [Abstract] |  |  |  |
Fees owed to Vornado | 324,000 |  | 324,000 |
Affiliated Entity [Member] | Property Management Fees And Leasing Fees [Member] | Kings Plaza Regional Shopping Center [Member] |  |  |  |
Other Agreements [Abstract] |  |  |  |
Fees to Related Party |  | $ 535,000 |  | $ 1,933,000

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