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Segment Information (Parentheticals) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization $ 438,954 $ 605,990 $ 1,643,020 $ 1,701,260
New York Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 251,030 206,663 704,290 610,036
Washington DC Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 86,942 217,567 257,964 414,391
Total Retail properties [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 74,581 73,505 515,313 220,600
Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 12,689 60,272 726 145,796
Office Properties [Member] | New York Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 172,367 139,894 476,849 418,414
Office Properties [Member] | Washington DC Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 76,061 206,945 225,009 382,423
Retail [Member] | New York Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 59,782 46,165 177,394 135,399
Alexanders Inc [Member] | New York Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 10,387 13,080 31,141 39,477
Hotel Pennsylvania [Member] | New York Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 8,494 7,524 18,906 16,746
Washington Dc Office Excluding Skyline Properties [Member] | Washington DC Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 69,220 197,009 202,463 350,296
Washington Dc Office Excluding Skyline Properties [Member] | Net Gain On Sale Of Real Estate [Member] | Washington DC Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization   126,621   126,621
Washington DC Skyline Properties [Member] | Washington DC Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 6,841 9,936 22,546 32,127
Washington Dc Residential Property [Member] | Washington DC Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 10,881 10,622 32,955 31,968
Retail Segment Strip Shopping Centers [Member] | Total Retail properties [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 59,175 49,378 264,065 148,554
Retail Segment Strip Shopping Centers [Member] | Litigation Settlement Income [Member] | Total Retail properties [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization     59,599  
Retail Segment Strip Shopping Centers [Member] | Net Gain On Sale Of Real Estate [Member] | Total Retail properties [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 16,087   81,806  
Retail Segment Regional Malls [Member] | Total Retail properties [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 15,406 24,127 251,248 72,046
Retail Segment Regional Malls [Member] | Net Gain On Sale Of Real Estate [Member] | Total Retail properties [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization     202,275  
LNR [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization   18,773 20,443 46,006
Merchandise Mart Building 7 West 34th Street And Trade Shows [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 15,006 13,869 52,167 46,518
Other Properties 555 California Street [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 10,720 10,714 32,371 31,406
India real estate ventures [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 695 1,841 4,708 1,718
Lexington Realty Trust [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization   7,859 6,931 24,780
Other Investments [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 5,330 9,280 14,207 30,226
Corporate general and administrative expenses [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization (23,467) (22,811) (71,054) (66,940)
Investment income and other, net [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 11,108 6,854 39,153 30,900
Net Gain On Sale Of Marketable Securities [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 31,741   31,741 3,582
Impairment loss on J.C. Penney owned shares [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization     (39,487)  
Gain Loss on Sale of J.C. Penney shares [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization (18,114)   (54,914)  
Income from the mark-to-market of J.C. Penney derivative position [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization (20,012) 4,344 (33,487) (53,343)
Merchandise Mart Reduction In Force And Severance Costs [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization   (1,014) (4,154) (1,520)
Merchandise Mart Discontinued Operations [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization (81) 32,087 2,065 88,488
Verde Realty Operating Partnership [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization   (4,936)   (4,936)
Aquisiiton Costs [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization (2,818) (1,070) (6,769) (4,314)
Net Gain On Sale Of Residential Condominiums [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 134   1,139 1,274
Net Income Attributable To Operating Partnership [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization (5,032) (14,837) (27,814) (31,445)
Preferred Unit Distributions Of The Operating Partnership [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization (12) (1,403) (1,146) (9,150)
Other Ebitda Attributable To Identifiable Investments [Member] | Other Segment [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 39,242 63,058 165,453 193,200
Income before net realized/unrealized gains [Member] | Other Segment [Member] | Real Estate Funds [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 1,997 1,874 1,746 4,162
Net unrealized gains [Member] | Other Segment [Member] | Real Estate Funds [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 3,092 1,389 14,869 8,384
Net realized gains [Member] | Other Segment [Member] | Real Estate Funds [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 2,046   2,046  
Carried Interest [Member] | Other Segment [Member] | Real Estate Funds [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization 356 (2,541) 15,965  
Total [Member] | Other Segment [Member] | Real Estate Funds [Member]
        
Segment Reporting Information [Line Items]        
Earnings Before Interest, Taxes, Depreciation, and Amortization $ 7,491 $ 722 $ 34,626 $ 12,546