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Commitments and Contingencies (Details) (USD $) |  |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 Lexington Avenue Property [Member] | Dec. 31, 2011 Kings Plaza Regional Shopping Center [Member] | Dec. 31, 2011 Paramus Property [Member] | Dec. 31, 2021 Paramus Property [Member] Tenant Occupant [Member] Ikea [Member] | Dec. 31, 2011 Paramus Property [Member] Tenant Occupant [Member] Ikea [Member] acre | Jun. 29, 2011 Flushing Property [Member] | Dec. 31, 2003 Flushing Property [Member] | Dec. 31, 2010 Flushing Property [Member] | Dec. 31, 2011 General Liability [Member] | Dec. 31, 2011 All Risk Property And Rental Value [Member] | Dec. 31, 2011 Terrorism Coverage Including Nbcr [Member] Self Insured [Member] | Dec. 31, 2011 Reinsurance For Terrorism Coverage Excluding Nbcr [Member] Third Party Carriers [Member] | Dec. 31, 2011 NBCR [Member]
Insurance [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans, recourse |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loan, carrying amount | 1,330,932,000 | 1,246,411,000 | 320,000,000 |  | 68,000,000.00 |  |  |  |  |  |  |  |  |  |
Insurance Maximum Coverage Per Incident |  |  |  |  |  |  |  |  |  |  | 300,000,000 | 1,700,000,000 | 1,700,000,000 | 1,700,000,000 |
Deductible |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 275,000
Self Insured Responsibility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00%
Federal Government Responsibility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00%
Environmental Remediation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated total costs associated with clean up |  |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |
Previously Paid Amounts For Environmental Liabilities |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
Flushing Property [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-refundable purchase deposit, portion recognized as income |  |  |  |  |  |  |  |  | 1,289,000 |  |  |  |  |  |
Non-refundable purchase deposit |  |  |  |  |  |  |  |  | 1,875,000 |  |  |  |  |  |
Non-refundable purchase deposit, transaction costs |  |  |  |  |  |  |  |  | 586,000 |  |  |  |  |  |
Litigation loss accrual |  |  |  |  |  |  |  |  |  | 3,135,000 |  |  |  |  |
Payments for Legal Settlements |  |  |  |  |  |  |  | 2,400,000 |  |  |  |  |  |  |
Gain (Loss) Related to Litigation Settlement |  |  |  |  |  |  |  | 807,000 |  |  |  |  |  |  |
Litigation Loss Reserves Previously Accrued |  |  |  |  |  |  |  | 3,207,000 |  |  |  |  |  |  |
Paramus Property [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acres Of Real Estate Land |  |  |  |  |  |  | 30.3 |  |  |  |  |  |  |  |
Leases Of Lessor Rental Term Range |  |  |  |  |  |  | 40 years |  |  |  |  |  |  |  |
Property purchase option exercisable be leasee |  |  |  |  |  | 75,000,000.00 |  |  |  |  |  |  |  |  |
Mortgage loan, carrying amount | 1,330,932,000 | 1,246,411,000 | 320,000,000 |  | 68,000,000.00 |  |  |  |  |  |  |  |  |  |
Fixed interest rate on the debt |  |  |  |  | 2.90% |  |  |  |  |  |  |  |  |  |
Triple-net rent, annual amount |  |  |  |  |  |  | 700,000.00 |  |  |  |  |  |  |  |
Purchase option exercised, proceeds from sale of land |  |  |  |  |  | 7,000,000.00 |  |  |  |  |  |  |  |  |
Purchase option excercised, gain on sale of land |  |  |  |  |  | 62,000,000.00 |  |  |  |  |  |  |  |  |
Purchase Option Not Excercised Amount Included In Triple Net Rent Over Remainder Of Lease |  |  |  |  |  | 68,000,000.00 |  |  |  |  |  |  |  |  |
Loan Amortization Period |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |
Letters Of Credit [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standby letters of credit, issued and outstanding | $ 4,998,000.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of acres related to land. + References No definition available. + Details
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- Definition The deductible owed by our wholly owned insurance subsidiary in the event of a covered loss + References No definition available. + Details
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- Definition Estimated total cost of environmental remediation + References No definition available. + Details
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- Definition The percentage of the covered portion of a loss above the deductible for which the Federal Government is responsible for covered losses + References No definition available. + Details
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- Details
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- Definition Insurance maximum coverage limit per incident + References No definition available. + Details
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- Definition Approximate rental term range for all outstanding leases to tenants in retail centers and office buildings. + References No definition available. + Details
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- Definition Amount of litigation loss reserves accrued in prior periods + References No definition available. + Details
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- Definition In the event the tenant does not exercise its purchase option, the period over which the tenant's debt service portion of its rent must be sufficient to fully amortize the loan on the property + References No definition available. + Details
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- Definition Amount of loan that will become recourse in case of a substantial casualty + References No definition available. + Details
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- Definition Amounts paid to date for environmental liabilities + References No definition available. + Details
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- Definition Lease with purchase option to be excercised by lessee + References No definition available. + Details
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- Definition The cash inflow from the sale of land held for use in case the purchase option is exercised by leasee. + References No definition available. + Details
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- Definition The amount to be amortized over the remainder of the lease term if the purchase option is not excercised. + References No definition available. + Details
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- Definition Amount of non refundable deposit recognized as income during the period + References No definition available. + Details
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- Definition Costs associated with the transaction from a party that agreed to purchase the property + References No definition available. + Details
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- Definition The percentage of the covered portion of a loss above the deductible for which our wholly owned insurance subsidiary is responsible for covered losses + References No definition available. + Details
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- Definition Triple-net rent, annual amount + References No definition available. + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The net proceeds or assets obtained in excess of (less than) the net carrying amount of assets recorded, or assets distributed and liabilities assumed less than (in excess of) estimated litigation liability extinguished, in settlement of a litigation matter. Represents (for other than an insurance entity in its normal claims settlement process), the amount of income (expense) recognized in the period to settle pending or threatened litigation and insurance claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 + Details
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- Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 + Details
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- Definition This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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