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Other Investments (Narrative) (Details)
 1 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
Investee
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
leaseasset
Dec. 31, 2014
USD ($)
Feb. 28, 2014
USD ($)
Schedule of Equity Method Investments [Line Items]          
Income from sales of real estate   $ 9,304,000 $ 157,431,000    
Net proceeds from sales of real estate     10,100,000    
Acquisitions of real estate assets   $ 0 $ 2,964,000    
Noncontrolling Interest, Ownership Percentage by Parent   90.00% 72.00% 72.00%  
Transfer Mortgage Payable     $ 26,000,000    
Number of Net Lease Assets Under Term Loan | Investee 1        
Distributions from operations of other investments   $ 13,487,000 76,719,000    
Equity method investments   290,519,000   $ 354,119,000  
Proceeds from Sale of Available-for-sale Securities, Equity   7,300,000      
Available-for-sale Securities, Gross Realized Gain (Loss)   2,500,000      
Marina Palms          
Schedule of Equity Method Investments [Line Items]          
Equity method investments   50,313,000   30,677,000  
Net Lease Venture          
Schedule of Equity Method Investments [Line Items]          
Acquisitions of real estate assets     $ 200,000,000    
Distributions from operations of other investments $ 61,200,000        
Equity method investments   $ 68,719,000   125,361,000  
Net Lease          
Schedule of Equity Method Investments [Line Items]          
Number of properties acquired | leaseasset     58    
MIRELF III          
Schedule of Equity Method Investments [Line Items]          
iStar's ownership percentage   32.90%      
MIRELF III AIV          
Schedule of Equity Method Investments [Line Items]          
iStar's ownership percentage   32.90%      
Madison GP1 Investors LP          
Schedule of Equity Method Investments [Line Items]          
iStar's ownership percentage   29.50%      
Madison International Real Estate Fund IILP          
Schedule of Equity Method Investments [Line Items]          
iStar's ownership percentage   29.50%      
Net Lease Asset One | Net Lease Venture          
Schedule of Equity Method Investments [Line Items]          
Net proceeds from sales of real estate     $ 93,700,000    
Land & Development | Marina Palms          
Schedule of Equity Method Investments [Line Items]          
iStar's ownership percentage   47.50%      
Total assets   $ 376,000,000   265,700,000  
Equity method investment, preferred interest   10,000,000      
Land & Development | Real Estate Equity Investment Two          
Schedule of Equity Method Investments [Line Items]          
iStar's ownership percentage     85.70%    
Equity method investments   7,400,000   9,400,000  
Loans Receivable, Commitments, Related Party     $ 45,700,000    
Land & Development | Other real estate equity investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investments   62,600,000   66,100,000  
Net Lease          
Schedule of Equity Method Investments [Line Items]          
Net proceeds from sales of real estate     $ 7,800,000    
Net Lease | Net Lease Venture          
Schedule of Equity Method Investments [Line Items]          
iStar's ownership percentage     51.90%   51.90%
Partners' capital account, contributions         $ 500,000,000
Equity method investment, related party ownership percentage         0.60%
Equity method investment, related party promote fee percentage         50.00%
Equity method investment, partner ownership percentage         47.50%
Net proceeds from sales of real estate     $ 93,700,000    
Total assets   387,200,000   348,100,000  
Operating Properties          
Schedule of Equity Method Investments [Line Items]          
Net proceeds from sales of real estate   $ 93,500,000      
Operating Properties | RCC          
Schedule of Equity Method Investments [Line Items]          
iStar's ownership percentage   50.00%      
Payments for other real estate equity investments   $ 55,400,000      
Income from sales of real estate   13,600,000      
Distributions from operations of other investments   21,000,000      
Operating Properties | Other real estate equity investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investments   $ 11,300,000   $ 13,200,000  
Minimum | Other real estate equity investments          
Schedule of Equity Method Investments [Line Items]          
iStar's ownership percentage   16.00%      
Maximum | Other real estate equity investments          
Schedule of Equity Method Investments [Line Items]          
iStar's ownership percentage   76.00%      
Loans Receivable and Other Lending Investments, Net | Land & Development | Real Estate Equity Investment Two          
Schedule of Equity Method Investments [Line Items]          
Loans Receivable, Related Party   $ 32,300,000      
Net Lease          
Schedule of Equity Method Investments [Line Items]          
Debt Instrument, Maturity Date 10 years        
Debt instrument, face amount $ 120,000,000.0