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Land and Development (Additional Information) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) a | Dec. 31, 2016 USD ($) real_estate_asset | Dec. 31, 2015 USD ($) | Apr. 21, 2017 | Apr. 30, 2015 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |
Land development revenue | $ 196,879,000 | $ 88,340,000 | $ 100,216,000 |  |
Land development cost of sales | 180,916,000 | 62,007,000 | 67,382,000 |  |
Payment to redeem a noncontrolling interest |  | 6,400,000 |  |  |
Income from sales of real estate | 92,049,000 | 105,296,000 | 93,816,000 |  |
Impairment of land and development assets | 20,500,000 | 3,800,000 | $ 4,600,000 |  |
Redeemable noncontrolling interests | 0 | 5,031,000 |  |  |
Redemption value | 0 | $ 0 |  |  |
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 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 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 |  |  |
Not Currently Redeemable |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Redeemable noncontrolling interests | 0 | $ 1,300,000 |  |  |
Prince George's County, Maryland |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Land development revenue | 114,000,000 |  |  |  |
Land development cost of sales | $ 106,300,000 |  |  |  |
Land subject to litigation (in acres) | a | 1,250 |  |  |  |
Bevard |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Increase in ownership percentage |  | 10.70% |  |  |
Payment to redeem a noncontrolling interest |  | $ 10,800,000 |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  | 95.70% |

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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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