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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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Land acreage subject to litigation.

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