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Land and Development (Additional Information) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) real_estate_asset | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Apr. 30, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |  |
Increase in ownership percentage | 10.70% |  |  |
Payment to redeem a noncontrolling interest | $ 10,800,000 | $ 6,400,000 |  |
Noncontrolling interest, ownership percentage by parent | 95.70% |  |  |
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 |
Impairment of land and development assets | 3,800,000 | 4,600,000 | 22,800,000 |
Redeemable noncontrolling interests | 5,031,000 | 10,718,000 |  |
Redemption value | $ 0 | 9,200,000 |  |
Newly Formed Unconsolidated Entity |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
iStar's ownership percentage | 50.00% |  |  |
Income from sales of real estate | $ 8,800,000 |  |  |
Real Estate Equity Investment Three |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Property sold, aggregate, carrying value |  |  | 6,800,000 |
Real Estate Acquired in Satisfaction of Debt |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Fair value of assets acquired |  | 13,400,000 |  |
Land |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Purchase price |  |  |  | $ 16,100,000
Deferred revenue |  |  |  | $ 5,300,000
Land | Real Estate Equity Investment Three |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Property contributed, aggregate carrying value |  |  | 9,500,000 |
Land | Real Estate Acquired in Satisfaction of Debt |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Number of real estate properties acquired | real_estate_asset | 2 |  |  |
Fair value of assets acquired | $ 40,600,000 |  | $ 5,500,000 |
Not Currently Redeemable |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Redeemable noncontrolling interests | $ 1,300,000 | $ 7,200,000 |  |

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