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Real Estate (Dispositions) (Details) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Condominium Units
Condominium_Unit
Sep. 30, 2012
Condominium Units
Condominium_Unit
Sep. 30, 2013
Condominium Units
Condominium_Unit
Sep. 30, 2012
Condominium Units
Condominium_Unit
Sep. 30, 2013
Net Lease
property
Sep. 30, 2012
Net Lease
property
Sep. 30, 2013
Commercial Operating Properties
property
Sep. 30, 2012
Commercial Operating Properties
property
Sep. 30, 2013
Land
Sep. 30, 2012
Land
Apr. 30, 2012
Portfolio Lease Asset Sale
Net Lease
property
Sep. 30, 2013
Portfolio Lease Asset Sale
Net Lease
Sep. 30, 2013
Real estate equity investments
Land
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                  
Number of condominium units sold         107 131 347 393                  
Income from sales of residential property $ 14,075,000 $ 15,584,000 $ 72,092,000 $ 35,583,000 $ 14,100,000 $ 15,600,000 $ 68,700,000 $ 35,600,000                  
Property sold, aggregate, carrying value                     70,500,000 13,100,000 8,600,000 64,500,000     21,400,000
Gain (Loss) on disposition of property, sale carve out                     19,100,000 1,400,000          
iStar's ownership percentage, equity method                                 47.50%
Gain (Loss) on Disposition of Property                                 3,400,000
Number of real estate properties sold                 4 2 5 6     12    
Net lease assets sold, carrying value                 15,700,000 9,800,000         105,700,000    
Gain (loss) on sale of leased assets, net, operating leases, sale carve out                 2,900,000 2,400,000         24,900,000    
Property subject to or available for operating lease transferred aggregate carrying value                               $ 8,700,000