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Other Investments (Narrative) (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) unit | Nov. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2016 USD ($) property unit | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) lease_asset | Feb. 28, 2014 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Contributions to other investments |  |  |  | $ 58,197,000 | $ 11,531,000 | $ 159,424,000 |
Noncontrolling interest, ownership percentage by parent | 95.70% |  |  | 95.70% |  |  |
Number of properties acquired | property |  |  |  | 2 |  |  |
Total assets | $ 2,803,411,000 |  |  | $ 2,803,411,000 | 3,597,587,000 |  |
Distributions from other investments |  |  |  | 92,482,000 | 119,854,000 | 61,031,000 |
Carrying value | 214,406,000 |  |  | 214,406,000 | 254,172,000 |  |
Land development revenue |  |  |  | 88,340,000 | 100,216,000 | 15,191,000 |
Land development cost of sales |  |  |  | 62,007,000 | 67,382,000 | 12,840,000 |
Income from sales of real estate |  |  |  | 105,296,000 | 93,816,000 | 89,943,000 |
Earnings (loss) from equity method investments |  |  |  | 77,349,000 | 32,153,000 | 94,905,000 |
(Recovery of) provision for loan losses |  |  |  | (12,514,000) | 36,567,000 | (1,714,000) |
Cost investments | 1,400,000 |  |  | 1,400,000 | 1,500,000 |  |
Proceeds from sale of available-for-sale securities |  |  |  |  | 7,400,000 |  |
Available-for-sale securities, realized gain |  |  |  |  | 2,600,000 |  |
iStar Net Lease I LLC |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Contributions to other investments |  |  |  | 37,700,000 |  |  |
Distributions from other investments |  | $ 13,200,000 | $ 61,200,000 |  |  |  |
iStar Net Lease I LLC | Net Lease |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Debt instrument term |  | 5 years | 10 years |  |  |  |
Debt instrument, face amount |  | $ 29,000,000.0 | $ 120,000,000.0 |  |  |  |
iStar Net Lease I LLC | Net Lease |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  | 51.90%
Partners' capital account, contributions (up to) |  |  |  |  |  |  | $ 500,000,000
Equity method investment, related party ownership percentage |  |  |  |  |  |  | 0.60%
Equity method investment, related party promote fee percentage |  |  |  |  |  |  | 50.00%
Equity method investment, partner ownership percentage |  |  |  |  |  |  | 47.50%
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 |
Acquisitions of real estate assets |  |  |  |  |  | $ 200,000,000 |
Total assets | $ 511,300,000 |  |  | 511,300,000 | 400,200,000 |  |
iStar Net Lease I LLC | Net Lease Asset One |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Net proceeds from sales of real estate |  |  |  |  |  | 93,700,000 |
iStar Net Lease I LLC | Other Income |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Management fees revenue |  |  |  | $ 1,600,000 | 1,500,000 | 1,300,000 |
Marina Palms |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage | 47.50% |  |  | 47.50% |  |  |
Number of units | unit | 468 |  |  | 468 |  |  |
Marina Palms | Land |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Total assets | $ 201,800,000 |  |  | $ 201,800,000 | 278,500,000 |  |
Marine Palms, LLC, North Tower |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of units for sale | unit | 1 |  |  | 1 |  |  |
Number of units | unit | 234 |  |  | 234 |  |  |
Marine Palms, LLC, South Tower |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of units | unit | 234 |  |  | 234 |  |  |
Percentage of units pre-sold |  |  |  | 83.00% |  |  |
Other real estate equity investments |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  | $ 11,600,000 |  | 32,900,000 |
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 | 85.00% |  |  | 85.00% |  |  |
Other real estate equity investments | Land |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Carrying value | $ 49,600,000 |  |  | $ 49,600,000 | 70,400,000 |  |
Other real estate equity investments | Operating Properties |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Carrying value | $ 3,600,000 |  |  | $ 3,600,000 | $ 11,100,000 |  |
Newly Formed Unconsolidated Entity |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage | 50.00% |  |  | 50.00% |  |  |
Income from sales of real estate |  |  |  | $ 8,800,000 |  |  |
RCC | Operating Properties |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage | 50.00% |  |  | 50.00% | 50.00% |  |
Contributions to other investments |  |  |  |  | $ 13,600,000 |  |
Distributions from other investments |  |  |  | $ 17,600,000 | 21,000,000 |  |
Sales price of real estate held for investment | $ 36,000,000 |  |  |  | 68,500,000 |  |
Proceeds from sale of other real estate, net of equity contribution | 7,000,000 |  |  |  | 55,400,000 |  |
Income from sales of real estate | 8,800,000 |  |  |  | 13,600,000 |  |
Loans commitment | 27,000,000 |  |  | 27,000,000 |  |  |
Payments for funding under loan commitments | $ 23,000,000 |  |  | 23,000,000 |  |  |
Equity Method Investee Two |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  | $ 11,600,000 |  | $ 23,400,000 |
Equity Method Investee Two | Land |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage | 50.00% |  |  | 50.00% |  | 85.70% |
Carrying value | $ 0 |  |  | $ 0 | 6,300,000 |  |
Loans commitment | $ 45,700,000 |  |  | 45,700,000 |  |  |
Interest and fee income |  |  |  | $ 3,600,000 | 3,900,000 | $ 600,000 |
Equity Method Investee Two | Land | Loans Receivable and Other Lending Investments, Net |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Payments for funding under loan commitments |  |  |  |  | 33,700,000 |  |
Real Estate Equity Investment Four | Land |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
iStar's ownership percentage | 20.10% |  |  | 20.10% |  | 15.70% |
Impairment |  |  |  | $ 3,600,000 |  |  |
Carrying value | $ 26,400,000 |  |  | 26,400,000 | $ 24,000,000 |  |
(Recovery of) provision for loan losses |  |  |  |  |  | $ 2,800,000 |
Payments for investments |  |  |  | $ 1,900,000 |  |  |

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