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Real Estate (Dispositions) (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 27, 2017
USD ($)
Apr. 30, 2017
USD ($)
lease
property
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
lease_asset
property
Dec. 31, 2015
USD ($)
property
Dec. 31, 2014
USD ($)
lease_asset
Feb. 28, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Net proceeds from sales of real estate           $ 435,560,000 $ 362,530,000 $ 404,336,000  
Number of Net Lease Assets | lease_asset           1      
Real estate, net     $ 1,387,274,000 $ 1,490,775,000   $ 1,387,274,000 1,490,775,000    
Cash Provided by (Used in) Operating Activities, Discontinued Operations           16,662,000 14,446,000 15,459,000  
Income from sales of real estate           $ 105,296,000 93,816,000 89,943,000  
Noncontrolling interest, ownership percentage by parent     95.70%     95.70%      
Cash Provided by (Used in) Investing Activities, Discontinued Operations           $ 7,972,000 0 0  
Deferred Expenses and Other Assets Net     $ 162,112,000 142,484,000   162,112,000 142,484,000    
Deferred operating lease income receivable, net     88,189,000 93,424,000   $ 88,189,000 93,424,000    
Number of properties acquired | property           2      
Ground Net Lease Business                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Real estate, net     104,500,000 103,200,000   $ 104,500,000 103,200,000    
Deferred Expenses and Other Assets Net     37,500,000 39,000,000   37,500,000 39,000,000    
Deferred operating lease income receivable, net     8,200,000 4,000,000   8,200,000 4,000,000    
Condominium Units                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Proceeds from sale of other real estate           97,800,000 127,900,000 236,200,000  
Income from sales of real estate           26,100,000 40,100,000 79,100,000  
Net Lease Asset Two                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Income from sales of real estate           21,100,000 40,100,000 6,200,000  
Net proceeds from sales of real estate           117,200,000 100,800,000 127,200,000  
Operating Properties                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Real estate, net     476,162,000 481,504,000   476,162,000 481,504,000    
Property sold, aggregate, carrying value             126,300,000    
Income from sales of real estate               4,600,000  
Net proceeds from sales of real estate             $ 93,500,000 34,200,000  
Operating leases, term             99 years    
Other finite-lived intangible assets       32,800,000     $ 32,800,000    
Payments for repurchase of redeemable noncontrolling interest       $ 6,400,000          
Number of real estate properties sold | property             3    
Operating Properties | RCC                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Income from sales of real estate           49,300,000 $ 13,600,000    
Sales price of real estate held for investment           229,100,000 $ 68,500,000    
iStar's ownership percentage       50.00%     50.00%    
Net Lease                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Real estate, net     911,112,000 $ 1,009,271,000   $ 911,112,000 $ 1,009,271,000    
Net Lease | iStar Net Lease I LLC                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
iStar's ownership percentage                 51.90%
Net proceeds from sales of real estate               $ 10,100,000  
Noncontrolling interest, ownership percentage by parent               72.00%  
Transfer mortgage payable               $ 26,000,000  
Number of properties acquired | lease_asset               58  
Operating Properties                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Property sold, aggregate, carrying value             5,000,000    
Operating Properties | RCC                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Income from sales of real estate     8,800,000       13,600,000    
Sales price of real estate held for investment     $ 36,000,000       $ 68,500,000    
iStar's ownership percentage     50.00% 50.00%   50.00% 50.00%    
Net Lease Asset One | iStar Net Lease I LLC                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Net proceeds from sales of real estate               $ 93,700,000  
Ground Net Lease Business                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Disposal Group, Including Discontinued Operation, Revenue           $ 21,839,000 $ 18,520,000 16,878,000  
Disposal Group, Including Discontinued Operation, Operating Expense           3,569,000 3,443,000 3,756,000  
Disposal Group, Including Discontinued Operation, Operating Income (Loss)           $ 18,270,000 $ 15,077,000 $ 13,122,000  
Subsequent Event | Safety, Income and Growth, Inc.                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Property, Plant and Equipment, Net   $ 161,100,000              
Subsequent Event | Ground Net Lease Business | Safety, Income and Growth, Inc.                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Net proceeds from sales of real estate   $ 113,000,000              
Number of Net Lease Assets | lease   7              
Payments to Acquire Equity Method Investments   $ 55,500,000              
Number of properties acquired | property   12              
Number of Master Lease Assets | lease   1              
Debt Instrument, Number of Properties Covered Under Master Lease Agreement | property   5              
Subsequent Event | Private Placement [Member] | Safety, Income and Growth, Inc.                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Proceeds from Issuance Initial Public Offering $ 205,000,000                
Proceeds from Issuance of Private Placement 45,000,000                
Subsequent Event | IPO [Member] | Safety, Income and Growth, Inc.                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Stock Issuance Costs $ 25,000,000                
Subsequent Event | 2017 Secured Financing                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Debt Instrument, Face Amount         $ 227,000,000.0        
Subsequent Event | Subsidiaries | Safety, Income and Growth, Inc.                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Related Party Transaction, Management Fee, Percent of Equity Below Threshold         1.00%