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Other Investments (Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 27, 2017
USD ($)
Apr. 14, 2017
USD ($)
investor
Nov. 01, 2018
shares
Jun. 30, 2018
USD ($)
lease
facility
May 31, 2018
USD ($)
office_building
Oct. 31, 2017
USD ($)
unit
Aug. 31, 2017
USD ($)
Apr. 30, 2017
USD ($)
property
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
plan
$ / shares
shares
Dec. 31, 2017
USD ($)
Aug. 31, 2018
USD ($)
Jan. 01, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]                                      
Gain on consolidation of equity method investment                 $ 0 $ 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              
Revenues                 122,141,000 119,872,000   657,956,000 576,059,000            
Payments to acquire equity method investments                       68,666,000 181,279,000            
Carrying value of assets                 5,079,989,000     5,079,989,000     $ 4,731,078,000        
Net proceeds from sales of real estate       $ 36,100,000               271,358,000 201,939,000            
Gain from discontinued operations                 0 0   0 123,418,000            
Carrying value of loans                 963,975,000     963,975,000     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         $ 5,409,000 [1] 19,313,000 [1]   $ 79,353,000 [1] 28,267,000 [1]            
Accounting Standards Update 2017-05                                      
Schedule of Equity Method Investments [Line Items]                                      
Carrying value of assets                                 $ 4,806,947,000    
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-05                                      
Schedule of Equity Method Investments [Line Items]                                      
Increase in retained earnings upon adoption of accounting standard                                 $ 55,500,000    
2017 Secured Financing                                      
Schedule of Equity Method Investments [Line Items]                                      
Debt instrument, face amount                                   $ 227,000,000.0  
Ground Net Lease Business | New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2017-05                                      
Schedule of Equity Method Investments [Line Items]                                      
Gain on sale of business                             178,900,000        
Safety, Income and Growth, Inc.                                      
Schedule of Equity Method Investments [Line Items]                                      
Equity interest (percent)                 40.50%     40.50%              
Number of institutional investors | investor   2                                  
Contributions by majority shareholders   $ 57,500,000                                  
Carrying value of assets   161,100,000                                  
Gain from discontinued operations               $ 123,400,000                      
Management fees waived                     $ 1,800,000                
Reimbursement revenue waived                     $ 800,000                
Safety, Income and Growth, Inc. | Management Fees                                      
Schedule of Equity Method Investments [Line Items]                                      
Revenue from related party                 $ 900,000                    
Safety, Income and Growth, Inc. | Expense Reimbursement                                      
Schedule of Equity Method Investments [Line Items]                                      
Revenue from related party                 400,000                    
Safety, Income and Growth, Inc. | Wholly-owned Subsidiary                                      
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              
Management fee, percent of equity above threshold                       0.75%              
Safety, Income and Growth, Inc. | 10b5-1 Plan                                      
Schedule of Equity Method Investments [Line Items]                                      
Number of shares purchased (in shares) | shares                 133,524         2,200,000          
Aggregate value of common stock purchased                 $ 2,200,000         $ 41,700,000          
Average share price (in dollars per share) | $ / shares                 $ 16.39         $ 18.67          
Common stock purchase plan, number of plans | plan                           2          
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                                    
Safety, Income and Growth, Inc. | Ground Net Lease Business                                      
Schedule of Equity Method Investments [Line Items]                                      
Payments to acquire equity method investments   $ 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                                  
Number of properties | property               12                      
iStar Net Lease II LLC                                      
Schedule of Equity Method Investments [Line Items]                                      
Equity interest (percent)                 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%              
Equity method investment, related party promote fee percentage                 50.00%     50.00%              
Equity method investment, partner ownership percentage                 47.50%     47.50%              
Net Lease Venture | Other Income | Management Fees                                      
Schedule of Equity Method Investments [Line Items]                                      
Revenues                 $ 300,000 600,000   $ 1,300,000 1,500,000            
Ground Lease, Atlanta medical office | Safety, Income and Growth, Inc.                                      
Schedule of Equity Method Investments [Line Items]                                      
Commitment to provide loan to lessee             $ 24,000,000                        
Loan term             1 year                        
Amount of loan funded                 15,500,000     15,500,000              
Interest income                 400,000     1,000,000              
Ground Lease, 100 and 200 Glenridge Point | Safety, Income and Growth, Inc.                                      
Schedule of Equity Method Investments [Line Items]                                      
Commitment to provide loan to lessee         $ 19,900,000                            
Loan term         1 year                            
Number of office buildings | office_building         2                            
Interest income                 600,000     800,000              
Great Oaks                                      
Schedule of Equity Method Investments [Line Items]                                      
Lessor, operating lease, term of contract           99 years                          
Number of units in real estate property to be built | unit           301                          
Real estate, leasehold improvement allowance           $ 7,200,000                          
Forward purchase contract, purchase agreement, amount           34,000,000                          
Great Oaks | Leasehold First Mortgage                                      
Schedule of Equity Method Investments [Line Items]                                      
Commitment to provide loan to lessee           80,500,000                          
Carrying value of loans           $ 80,500,000                          
Other Real Estate Equity Investments | Operating Properties                                      
Schedule of Equity Method Investments [Line Items]                                      
Equity method investments, carrying value                 74,100,000     74,100,000     38,800,000        
Other Real Estate Equity Investments | Land & Development                                      
Schedule of Equity Method Investments [Line Items]                                      
Equity method investments, carrying value                 $ 70,400,000     $ 70,400,000     63,800,000        
Other Real Estate Equity Investments | Minimum                                      
Schedule of Equity Method Investments [Line Items]                                      
Equity interest (percent)                 15.50%     15.50%              
Other Real Estate Equity Investments | Maximum                                      
Schedule of Equity Method Investments [Line Items]                                      
Equity interest (percent)                 95.00%     95.00%              
Other Real Estate Equity Investment Aug 2018                                      
Schedule of Equity Method Investments [Line Items]                                      
Equity interest (percent)                 50.00%     50.00%              
Interest income                 $ 400,000     $ 400,000              
Loan commitments                               $ 33,000,000      
Loans receivable, carrying value                 $ 28,900,000     $ 28,900,000              
Other Real Estate Equity Investment Dec 2016                                      
Schedule of Equity Method Investments [Line Items]                                      
Equity interest (percent)                 50.00%     50.00%              
Interest income                 $ 500,000 $ 500,000   $ 1,500,000 $ 1,400,000            
Loan commitments                                     $ 27,000,000
Loans receivable, carrying value                 $ 27,000,000     27,000,000     $ 25,400,000        
Subsequent Event | Safety, Income and Growth, Inc.                                      
Schedule of Equity Method Investments [Line Items]                                      
Common stock received as payment of management fee | shares     45,941                                
Noncontrolling Interests                                      
Schedule of Equity Method Investments [Line Items]                                      
Increase in noncontrolling interest from consolidation of equity method investment                       $ 188,279,000              
[1] Income from sales of real estate represents gains from sales of real estate that do not qualify as discontinued operations