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Other Investments (Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 27, 2017
USD ($)
Apr. 14, 2017
USD ($)
Apr. 30, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
Jun. 30, 2017
USD ($)
unit
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
unit
Jun. 30, 2016
USD ($)
Mar. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]                  
Net proceeds from sales of other investments             $ 0 $ 39,810,000  
Earnings from equity method investments         $ 5,515,000 $ 39,447,000 11,217,000 47,714,000  
Acquisitions of real estate assets             0 3,915,000  
Net proceeds from sales of real estate             154,291,000 247,956,000  
Carrying value of assets       $ 4,825,514,000 4,914,755,000   4,914,755,000    
Gain sale of properties [1]         $ 844,000 43,484,000 $ 8,954,000 53,943,000  
Noncontrolling interest, ownership percentage by parent         95.70%   95.70%    
Equity method investments, carrying value       214,406,000 $ 276,821,000   $ 276,821,000    
Contributions             139,139,000 8,283,000  
Cost method investments       1,400,000 900,000   900,000    
Other real estate equity investments | Operating Properties                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investments, carrying value       3,600,000 7,900,000   7,900,000    
Contributions       7,000,000          
Loan commitments       27,000,000          
Loans receivable, carrying value       22,700,000 23,600,000   23,600,000    
Interest income         500,000   900,000    
Other real estate equity investments | Land & Development                  
Schedule of Equity Method Investments [Line Items]                  
Equity method investments, carrying value       49,600,000 $ 55,200,000   $ 55,200,000    
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         85.00%   85.00%    
Oak Hill Funds                  
Schedule of Equity Method Investments [Line Items]                  
Earnings from equity method investments           500,000   3,700,000  
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    
Total assets carrying value       511,300,000 $ 626,500,000   626,500,000    
Net lease venture | Other income                  
Schedule of Equity Method Investments [Line Items]                  
Management fees revenue         $ 500,000 400,000 $ 900,000 800,000  
Marina Palms                  
Schedule of Equity Method Investments [Line Items]                  
iStar's ownership percentage         47.50%   47.50%    
Total assets carrying value       $ 201,800,000 $ 52,700,000   $ 52,700,000    
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             84.00%    
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         28.00%   28.00%    
Contributions by majority shareholders   $ 57,500,000              
Carrying value of assets     $ 161,100,000            
Gain sale of properties     123,400,000            
Safety, Income and Growth, Inc. | IPO                  
Schedule of Equity Method Investments [Line Items]                  
Payments of Stock Issuance Costs $ 16,600,000                
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  
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     227,000,000.0   227,000,000.0   $ 227,000,000.0
Real estate equity investments                  
Schedule of Equity Method Investments [Line Items]                  
Earnings from equity method investments         5,155,000 34,724,000 10,610,000 42,189,000  
Equity method investments, carrying value       $ 181,056,000 249,582,000   249,582,000    
Real estate equity investments | Safety, Income and Growth, Inc.                  
Schedule of Equity Method Investments [Line Items]                  
Earnings from equity method investments           0 48,000 0  
Equity method investments, carrying value       0 50,287,000   50,287,000    
Real estate equity investments | Other real estate equity investments                  
Schedule of Equity Method Investments [Line Items]                  
Earnings from equity method investments         2,892,000 28,600,000 4,249,000 26,898,000  
Equity method investments, carrying value       53,202,000 63,107,000   63,107,000    
Real estate equity investments | Net lease venture                  
Schedule of Equity Method Investments [Line Items]                  
Earnings from equity method investments         1,032,000 944,000 2,013,000 1,890,000  
Equity method investments, carrying value       92,669,000 128,997,000   128,997,000    
Real estate equity investments | Marina Palms                  
Schedule of Equity Method Investments [Line Items]                  
Earnings from equity method investments         1,183,000 $ 5,180,000 4,300,000 $ 13,401,000  
Equity method investments, carrying value       $ 35,185,000 7,191,000   $ 7,191,000    
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         $ 48,000        
[1] Income from sales of real estate represents gains from sales of real estate that do not qualify as discontinued operations.