Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Mack-Green-Gale LLC/Gramercy Agreement) (Details)

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Investments In Unconsolidated Joint Ventures (Mack-Green-Gale LLC/Gramercy Agreement) (Details) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 0 Months Ended
Oct. 18, 2012
Gramercy Agreement [Member]
item
Dec. 17, 2010
Gramercy Agreement [Member]
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Apr. 29, 2009
Gramercy Agreement [Member]
Sep. 30, 2012
Gramercy Agreement [Member]
Sep. 30, 2011
Gramercy Agreement [Member]
Mar. 31, 2010
Gramercy Agreement [Member]
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Sep. 30, 2012
Gramercy Agreement [Member]
Sep. 30, 2011
Gramercy Agreement [Member]
Dec. 31, 2008
Gramercy Agreement [Member]
Mar. 31, 2009
Gramercy Agreement [Member]
May 09, 2006
Mack-Green [Member]
Sep. 30, 2012
Mack-Green [Member]
Apr. 29, 2009
Mack-Green [Member]
Sep. 30, 2012
SL Green [Member]
Sep. 30, 2012
OPLP [Member]
Mar. 31, 2009
OPLP [Member]
Dec. 31, 2007
OPLP [Member]
May 09, 2006
OPLP [Member]
property
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May 09, 2006
OPLP [Member]
Mack-Green [Member]
Sep. 30, 2012
Ten Operating Partnerships [Member]
Mack-Green [Member]
property
Sep. 30, 2012
Ten Operating Partnerships [Member]
SL Green [Member]
Sep. 30, 2012
Eight Operating Partnerships [Member]
Mack-Green [Member]
property
Sep. 30, 2012
Eight Operating Partnerships [Member]
SL Green [Member]
May 09, 2006
New Jersey [Member]
OPLP [Member]
property
sqft
May 09, 2006
Michigan [Member]
OPLP [Member]
property
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Schedule of Equity Method Investments [Line Items]                                                  
Percentage of interest in venture                         100.00%         100.00% 96.00%            
Acquisition cost                     $ 125,000,000                            
Mortgage loans, carrying amount                   90,300,000           276,300,000                  
Mortgage finance on property obtained   11,000,000                                              
Number of properties                   6   4               10   8      
Mortgage loan, maturity date             May 2009               May 2016                    
Area of office property sold, square feet   198,376       121,314                                     1,200,000
Area of office property, square feet                                   3,500,000           2,300,000  
Spread over LIBOR     2.75%             2.75%                              
Interest rate cap     3.15%                                            
Period in advance of agreement end date that fair market value estimates are to be provided             6 months                                    
Venture sale of real estate           13,900,000                     83,500,000                
Management, leasing and other services fees       117,000 108,000   354,000 382,000                                  
Number of deeds transferred 4                                                
Mortgage loans on real estate bearing weighted average fixed interest rate                               185,000,000                  
Weighted average fixed interest rate                               6.26%                  
Repayments of debt   26,800,000                                              
Number of owned office properties                                   25           17  
Number of properties sold           1                                     8
Venture gain (loss) on sale of real estate                                 (22,300,000)                
Profit sharing percentage                       50.00%   50.00%           99.00% 1.00%   99.00%    
Impairment charge on property                 $ 32,300,000                                
Sharing percent of amount realized     50.00%                                            
Holding and distribution pattern under operating agreement                       The Mack-Green operating agreement generally provided for profits and losses to be allocated as follows:  99 percent of Mack-Green's share of the profits and losses from 10 specific OPLP Properties allocable to the Company and one percent allocable to SL Green; (ii) one percent of Mack-Green's share of the profits and losses from eight specific OPLP Properties and its minor interest in four office properties allocable to the Company and 99 percent allocable to SL Green; and (iii) 50 percent of all other profits and losses allocable to the Company and 50 percent allocable to SL Green.