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Investments In Unconsolidated Joint Ventures (Mack-Green-Gale LLC/Gramercy Agreement) (Details) (USD $)
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0 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 0 Months Ended | 6 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | |||||||||||||
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Dec. 17, 2010
Gramercy Agreement [Member]
sqft
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Apr. 29, 2009
Gramercy Agreement [Member]
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Jun. 30, 2012
Gramercy Agreement [Member]
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Jun. 30, 2011
Gramercy Agreement [Member]
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Mar. 31, 2010
Gramercy Agreement [Member]
sqft
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Mar. 31, 2009
Gramercy Agreement [Member]
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Jun. 30, 2012
Gramercy Agreement [Member]
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Jun. 30, 2011
Gramercy Agreement [Member]
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Dec. 31, 2008
Gramercy Agreement [Member]
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May 09, 2006
Mack-Green [Member]
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Jun. 30, 2012
Mack-Green [Member]
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Apr. 29, 2009
Mack-Green [Member]
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Jun. 30, 2012
SL Green [Member]
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Mar. 31, 2009
OPLP [Member]
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Dec. 31, 2007
OPLP [Member]
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May 09, 2006
OPLP [Member]
sqft
property
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May 09, 2006
OPLP [Member]
Mack-Green [Member]
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Jun. 30, 2012
Ten Operating Partnerships [Member]
Mack-Green [Member]
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Jun. 30, 2012
Ten Operating Partnerships [Member]
SL Green [Member]
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Jun. 30, 2012
Eight Operating Partnerships [Member]
Mack-Green [Member]
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Jun. 30, 2012
Eight Operating Partnerships [Member]
SL Green [Member]
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May 09, 2006
New Jersey [Member]
OPLP [Member]
sqft
property
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May 09, 2006
Michigan [Member]
OPLP [Member]
property
sqft
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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 | |||||||||||||||||||||
| 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 | 275 | 275 | |||||||||||||||||||||
| Interest rate cap | 3.15% | ||||||||||||||||||||||
| Venture sale of real estate | 13,900,000 | 83,500,000 | |||||||||||||||||||||
| Management, leasing and other services fees | 112,000 | 113,000 | 237,000 | 274,000 | |||||||||||||||||||
| 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% | 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. | ||||||||||||||||||||||