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Other Investments (Narrative) (Details)
$ / shares in Units, shares in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 27, 2017
USD ($)
Apr. 14, 2017
USD ($)
Aug. 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
unit
$ / shares
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
unit
Sep. 30, 2016
USD ($)
office
Mar. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]                      
Net proceeds from sales of other investments                 $ 0 $ 39,810,000  
Distributions from operations of other investments                 39,076,000 44,893,000  
Earnings from equity method investments             $ 2,461,000 $ 26,540,000 13,677,000 74,254,000  
Acquisitions of real estate assets                 0 4,740,000  
Net proceeds from sales of real estate                 201,939,000 412,335,000  
Payments to acquire equity method investments                 181,279,000 45,635,000  
Noncontrolling interest, ownership percentage by parent         95.70%            
Carrying value of assets         $ 4,825,514,000   5,795,219,000   5,795,219,000    
Gain from discontinued operations             0 0 123,418,000 0  
Equity method investments, carrying value         214,406,000   289,037,000   289,037,000    
Cost method investments         1,400,000   800,000   800,000    
Other real estate equity investments | Operating Properties                      
Schedule of Equity Method Investments [Line Items]                      
Payments to acquire equity method investments         7,000,000            
Equity method investments, carrying value         3,600,000   21,800,000   21,800,000    
Loan commitments         27,000,000            
Loans receivable, carrying value         22,700,000   24,300,000   24,300,000    
Interest income             500,000   1,400,000    
Other real estate equity investments | Land & Development                      
Schedule of Equity Method Investments [Line Items]                      
Equity method investments, carrying value         49,600,000   $ 57,900,000   $ 57,900,000    
Other real estate equity investments | Minimum                      
Schedule of Equity Method Investments [Line Items]                      
iStar's ownership percentage             20.00%   20.00%    
Other real estate equity investments | Maximum                      
Schedule of Equity Method Investments [Line Items]                      
iStar's ownership percentage             95.00%   95.00%    
Oak Hill Funds                      
Schedule of Equity Method Investments [Line Items]                      
Earnings from equity method investments               600,000   $ 4,300,000  
Net lease venture                      
Schedule of Equity Method Investments [Line Items]                      
iStar's ownership percentage             51.90%   51.90%    
Partners' capital account, contributions (up to)             $ 500,000,000   $ 500,000,000    
Equity method investment, related party ownership percentage             0.60%   0.60%    
Equity method investment, related party promote fee percentage             50.00%   50.00%    
Equity method investment, partner ownership percentage             47.50%   47.50%    
Acquisitions of real estate assets                 $ 59,000,000    
Net proceeds from sales of real estate                 6,200,000    
Financing derecognized after sale                 18,900,000    
Number of properties | office                   2  
Distributions received from Net Lease Venture                 23,700,000 $ 3,900,000  
Total assets carrying value         511,300,000   $ 635,100,000   635,100,000    
Payments to acquire equity method investments                 37,700,000 35,600,000  
Net lease venture | Other income                      
Schedule of Equity Method Investments [Line Items]                      
Management fees revenue             $ 600,000 400,000 $ 1,500,000 1,200,000  
Marina Palms                      
Schedule of Equity Method Investments [Line Items]                      
iStar's ownership percentage             47.50%   47.50%    
Total assets carrying value         $ 201,800,000   $ 43,500,000   $ 43,500,000    
Number of units | unit             468   468    
Marine Palms North Tower                      
Schedule of Equity Method Investments [Line Items]                      
Number of units | unit             234   234    
Number of units remaining for sale | unit             1   1    
Marine Palms South Tower                      
Schedule of Equity Method Investments [Line Items]                      
Number of units | unit             234   234    
Percentage of units pre-sold                 85.00%    
Newly formed unconsolidated entity                      
Schedule of Equity Method Investments [Line Items]                      
iStar's ownership percentage         50.00%            
Safety, Income and Growth, Inc.                      
Schedule of Equity Method Investments [Line Items]                      
iStar's ownership percentage             35.00%   35.00%    
Contributions by majority shareholders   $ 57,500,000                  
Carrying value of assets   161,100,000                  
Gain from discontinued operations       $ 123,400,000              
Safety, Income and Growth, Inc. | Ground Lease [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Commitment to provide loan to lessee     $ 24,000,000                
Loan term     1 year                
Amount of loan funded             $ 5,100,000   $ 5,100,000    
Safety, Income and Growth, Inc. | IPO                      
Schedule of Equity Method Investments [Line Items]                      
Payments of Stock Issuance Costs $ 18,900,000                    
Offering costs 25,000,000                    
Safety, Income and Growth, Inc. | Private Placement                      
Schedule of Equity Method Investments [Line Items]                      
Proceeds from issuance initial public offering 205,000,000                    
Proceeds from issuance of private placement $ 45,000,000                    
Wholly-owned Subsidiary | Other real estate equity investments                      
Schedule of Equity Method Investments [Line Items]                      
Net proceeds from sales of other investments           $ 39,800,000          
Gain on sale of equity method investment           31,500,000          
Gain on sale of equity method investment attributable to noncontrolling interest           $ 10,100,000          
Distributions from operations of other investments               15,800,000   11,600,000  
Wholly-owned Subsidiary | Safety, Income and Growth, Inc.                      
Schedule of Equity Method Investments [Line Items]                      
Management fee, percent of equity below threshold                 1.00%    
Management fee, percent of equity above threshold                 0.75%    
Management fee, shareholders' equity threshold amount             2,500,000,000.0   $ 2,500,000,000.0    
Ground Net Lease Business | Safety, Income and Growth, Inc.                      
Schedule of Equity Method Investments [Line Items]                      
Net proceeds from sales of real estate   113,000,000   $ 113,000,000              
Number of properties | property       12              
Payments to acquire equity method investments   $ 55,500,000   $ 55,500,000              
Noncontrolling interest (as a percent)   49.00%                  
Noncontrolling interest, ownership percentage by parent   51.00%                  
2017 Secured Financing                      
Schedule of Equity Method Investments [Line Items]                      
Debt instrument, face amount                     $ 227,000,000.0
Real estate equity investments                      
Schedule of Equity Method Investments [Line Items]                      
Earnings from equity method investments             1,851,000 23,194,000 12,461,000 65,383,000  
Equity method investments, carrying value         $ 181,056,000   270,313,000   270,313,000    
Real estate equity investments | Safety, Income and Growth, Inc.                      
Schedule of Equity Method Investments [Line Items]                      
Earnings from equity method investments               0 388,000 0  
Equity method investments, carrying value         0   75,023,000   75,023,000    
Real estate equity investments | Other real estate equity investments                      
Schedule of Equity Method Investments [Line Items]                      
Earnings from equity method investments             55,000 16,289,000 4,304,000 43,187,000  
Equity method investments, carrying value         53,202,000   79,768,000   79,768,000    
Real estate equity investments | Net lease venture                      
Schedule of Equity Method Investments [Line Items]                      
Earnings from equity method investments             962,000 723,000 2,975,000 2,613,000  
Equity method investments, carrying value         92,669,000   110,153,000   110,153,000    
Real estate equity investments | Marina Palms                      
Schedule of Equity Method Investments [Line Items]                      
Earnings from equity method investments             494,000 $ 6,182,000 4,794,000 $ 19,583,000  
Equity method investments, carrying value         $ 35,185,000   5,369,000   $ 5,369,000    
Real estate equity investments | Safety, Income and Growth, Inc. | Safety, Income and Growth, Inc.                      
Schedule of Equity Method Investments [Line Items]                      
Earnings from equity method investments             $ 340,000        
10b5-1 Plan | Safety, Income and Growth, Inc.                      
Schedule of Equity Method Investments [Line Items]                      
Number of shares purchased | shares             1,300        
Aggregate value of common stock purchased             $ 24,500,000        
Average share price (in dollars per share) | $ / shares             $ 19.20        
Chief Executive Officer and Chief Financial Officer | 10b5-1 Plan | Safety, Income and Growth, Inc.                      
Schedule of Equity Method Investments [Line Items]                      
Number of shares purchased | shares             26        
Aggregate value of common stock purchased             $ 500,000        
Average share price (in dollars per share) | $ / shares             $ 19.20