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Other Investments (Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 27, 2017
USD ($)
Apr. 14, 2017
USD ($)
Jun. 30, 2018
USD ($)
lease
facility
May 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
unit
Aug. 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
plan
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Jan. 01, 2018
USD ($)
Mar. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]                                
Gain on consolidation of equity method investment                 $ 67,877,000 $ 0 $ 67,877,000 $ 0        
Increase in noncontrolling interest from consolidation of equity method investment                     188,279,000          
Increase in redeemable noncontrolling interest from consolidation of equity method investment                     11,800,000          
Payments to acquire equity method investments                     53,012,000 139,139,000        
Carrying value of assets     $ 5,358,167,000           5,358,167,000   5,358,167,000   $ 5,358,167,000 $ 4,731,078,000    
Net proceeds from sales of real estate     36,100,000               238,834,000 154,291,000        
Gain from discontinued operations                 0 123,418,000 0 123,418,000        
Retained deficit     (2,325,291,000)           (2,325,291,000)   (2,325,291,000)   (2,325,291,000) (2,470,564,000)    
Debt obligation     3,928,372,000           3,928,372,000   3,928,372,000   3,928,372,000 3,539,991,000    
Carrying value of loans     $ 989,002,000           989,002,000   989,002,000   989,002,000 1,289,568,000    
Number of industrial facilities sold | facility     2                          
Number of ground leases structured and entered into | lease     2                          
Number of ground leases sold | lease     2                          
Gain on sale of real estate     $ 24,500,000           56,895,000 [1] 844,000 [1] 73,943,000 [1] 8,954,000 [1]        
Equity method investments, carrying value     $ 293,017,000           $ 293,017,000   $ 293,017,000   $ 293,017,000 321,241,000    
iStar Net Lease II LLC                                
Schedule of Equity Method Investments [Line Items]                                
Equity interest in lease acquisition and development venture (percent)     51.90%           51.90%   51.90%   51.90%      
Net lease venture                                
Schedule of Equity Method Investments [Line Items]                                
Equity method investment, related party ownership percentage     0.60%           0.60%   0.60%   0.60%      
Equity method investment, related party promote fee percentage     50.00%           50.00%   50.00%   50.00%      
Equity method investment, partner ownership percentage     47.50%           47.50%   47.50%   47.50%      
Net lease venture | Other income                                
Schedule of Equity Method Investments [Line Items]                                
Management fees revenue                 $ 700,000 500,000 $ 1,300,000 900,000        
Safety, Income and Growth, Inc.                                
Schedule of Equity Method Investments [Line Items]                                
Management fees waived                 900,000   1,800,000          
Reimbursement revenue waived                 400,000   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     $ 62,000,000           62,000,000   62,000,000   $ 62,000,000 38,800,000    
Loan commitments               $ 27,000,000                
Loans receivable, carrying value     26,800,000           26,800,000   26,800,000   26,800,000 25,400,000    
Interest income                 500,000 500,000 1,000,000 900,000        
Other real estate equity investments | Land & Development                                
Schedule of Equity Method Investments [Line Items]                                
Equity method investments, carrying value     $ 76,700,000           $ 76,700,000   $ 76,700,000   $ 76,700,000 $ 61,300,000    
Other real estate equity investments | Minimum                                
Schedule of Equity Method Investments [Line Items]                                
Equity interest in lease acquisition and development venture (percent)     15.50%           15.50%   15.50%   15.50%      
Other real estate equity investments | Maximum                                
Schedule of Equity Method Investments [Line Items]                                
Equity interest in lease acquisition and development venture (percent)     95.00%           95.00%   95.00%   95.00%      
Great Oaks                                
Schedule of Equity Method Investments [Line Items]                                
Lessor, operating lease, term of contract         99 years                      
Real estate, leasehold improvement allowance         $ 7,200,000                      
Forward purchase contract, purchase agreement, amount         $ 34,000,000                      
Number of units in real estate property to be built | unit         301                      
Great Oaks | Leasehold First Mortgage                                
Schedule of Equity Method Investments [Line Items]                                
Debt obligation         $ 80,500,000                      
Carrying value of loans         $ 80,500,000                      
Newly formed unconsolidated entity                                
Schedule of Equity Method Investments [Line Items]                                
Equity interest in lease acquisition and development venture (percent)     50.00%           50.00%   50.00%   50.00%      
Safety, Income and Growth, Inc.                                
Schedule of Equity Method Investments [Line Items]                                
Equity interest in lease acquisition and development venture (percent)     39.80%           39.80%   39.80%   39.80%      
Contributions by majority shareholders   $ 57,500,000                            
Carrying value of assets   161,100,000                            
Gain from discontinued operations             $ 123,400,000                  
Gain on sale of real estate             123,400,000                  
Safety, Income and Growth, Inc. | Ground Lease                                
Schedule of Equity Method Investments [Line Items]                                
Commitment to provide loan to lessee       $ 19,900,000   $ 24,000,000                    
Loan term       1 year   1 year                    
Amount of loan funded     $ 13,000,000           $ 13,000,000   $ 13,000,000   $ 13,000,000      
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                              
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                              
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, shareholders' equity threshold amount     $ 2,500,000,000.0           $ 2,500,000,000.0   $ 2,500,000,000.0   $ 2,500,000,000.0      
Management fee, percent of equity above threshold                     0.75%          
Ground Net Lease Business | Safety, Income and Growth, Inc.                                
Schedule of Equity Method Investments [Line Items]                                
Payments to acquire equity method investments   $ 55,500,000         55,500,000                  
Noncontrolling interest (as a percent)   49.10%                            
Noncontrolling interest, ownership percentage by parent   50.90%                            
Net proceeds from sales of real estate   $ 113,000,000         $ 113,000,000                  
Number of properties | property             12                  
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
10b5-1 Plan | Safety, Income and Growth, Inc.                                
Schedule of Equity Method Investments [Line Items]                                
Number of shares purchased | shares                         2,200,000      
Aggregate value of common stock purchased                         $ 41,700,000      
Average share price (in dollars per share) | $ / shares                         $ 18.67      
Common stock purchase plan, number of plans | plan                         2      
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                           26,000    
Aggregate value of common stock purchased                           $ 500,000    
Average share price (in dollars per share) | $ / shares                           $ 19.20    
Accounting Standards Update 2017-05                                
Schedule of Equity Method Investments [Line Items]                                
Carrying value of assets                             $ 4,806,947,000  
Retained deficit                             (2,394,695,000)  
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-05                                
Schedule of Equity Method Investments [Line Items]                                
Retained deficit                             $ 55,500,000  
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-05 | Ground Net Lease Business                                
Schedule of Equity Method Investments [Line Items]                                
Gain on sale of business                           $ 178,900,000    
[1] Income from sales of real estate represents gains from sales of real estate that do not qualify as discontinued operations