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Significant Accounting Policies (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Real Estate [Abstract] |  |  |  |  |  |  |  |  |  |  |
Capitalized Interest |  |  |  |  |  |  |  |  | $ 0 | $ 1,269,000 | $ 3,452,000
Cash and Cash Equivalents [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cash And Cash Equivalent Maturity Maximum |  |  |  |  |  |  |  |  | 3 months |  |
Short-term Investments [Abstract] |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Maturity, Date Range, Low |  |  |  |  |  |  |  |  | 3 months |  |
Available-for-sale Securities, Debt Maturity, Date Range, High |  |  |  |  |  |  |  |  | 6 months |  |
Allowance For Doubtful Accounts [Abstract] |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable | 1,039,000 |  |  |  | 1,047,000 |  |  |  | 1,039,000 | 1,047,000 |
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Real Estate Investment Trust Distributable Income Policy |  |  |  |  |  |  |  |  | 90.00% |  |
Internal Taxable Income Distribution Policy |  |  |  |  |  |  |  |  | 100.00% |  |
Differences Between Book and Tax Basis | 209,775,000 |  |  |  |  |  |  |  | 209,775,000 |  |
Deferred Tax Assets (Liabilities), Net | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Reconciliation of Net Income to Estimated Taxable Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Alexander's | 20,634,000 | 20,425,000 | 20,157,000 | 18,207,000 | 17,891,000 | 17,875,000 | 15,549,000 | 15,114,000 | 79,423,000 | 66,429,000 | 132,190,000
Straight-lining of rental income |  |  |  |  |  |  |  |  | (12,609,000) | (15,182,000) | (23,381,000)
Depreciation and amortization timing differences |  |  |  |  |  |  |  |  | 1,263,000 | 602,000 | 1,385,000
Reversal of liablity for income taxes |  |  |  |  |  |  |  |  | 0 | (3,162,000) | (37,307,000)
Interest expense |  |  |  |  |  |  |  |  | (2,425,000) | 0 | (107,000)
Stock appreciation rights compensation expense |  |  |  |  |  |  |  |  | 0 | 0 | (57,113,000)
Other |  |  |  |  |  |  |  |  | (3,429,000) | 6,245,000 | (3,395,000)
Taxable income before NOL |  |  |  |  |  |  |  |  | 62,223,000 | 54,932,000 | 12,272,000
NOL carried forward | 0 |  |  |  | (16,939,000) |  |  |  | 0 | (16,939,000) | (29,211,000)
Taxable income/(NOL) |  |  |  |  |  |  |  |  | $ 62,223,000 | $ 37,993,000 | $ (16,939,000)
Rego Park I Shopping Center |  |  |  |  |  |  |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of cash mortgage collateralized | 100.00% |  |  |  |  |  |  |  | 100.00% |  |

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