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Other Investments (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 7 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Apr. 30, 2013 USD ($) | Jul. 31, 2010 USD ($) | Jun. 30, 2013 USD ($) | Mar. 31, 2013 USD ($) | Dec. 31, 2013 USD ($) | Apr. 19, 2013 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) Investee lease_asset property | Dec. 31, 2013 USD ($) | Sep. 30, 2012 USD ($) | Apr. 30, 2014 USD ($) | Feb. 28, 2014 USD ($) | Jul. 28, 2010 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  | $ 254,172,000 | $ 354,119,000 |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  |  |  |  |  | 32,153,000 | 94,905,000 | $ 41,520,000 |  |  |  |
Income from sales of real estate |  |  |  |  |  |  |  | 93,816,000 | 89,943,000 | 86,658,000 |  |  |  |
Distributions from other investments |  |  |  |  |  |  |  | 119,854,000 | 61,031,000 | 36,918,000 |  |  |  |
Net proceeds from sales of real estate |  |  |  |  |  |  |  | 362,530,000 | 404,336,000 | 437,817,000 |  |  |  |
Contributions to other investments |  |  |  |  |  |  |  | 11,531,000 | 159,424,000 | 12,784,000 |  |  |  |
Provision for (recovery of) loan losses |  |  |  |  |  |  |  | 36,567,000 | (1,714,000) | 5,489,000 |  |  |  |
Proceeds from sale of available-for-sale securities |  |  |  |  |  |  |  | 7,400,000 |  |  |  |  |  |
Available-for-sale securities, realized gain |  |  |  |  |  |  |  | 2,600,000 |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  | 134,687,000 | 122,704,000 | 108,015,000 |  |  |  |
Distributions from operations of other investments |  |  |  |  |  |  |  | 29,999,000 | 80,116,000 | 17,252,000 |  |  |  |
Net Lease Asset One |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sales of real estate |  |  |  |  |  |  |  |  | $ 7,800,000 |  |  |  |  |
Land |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from sales of real estate |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |
Number of properties acquired | property |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Operating Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sales of real estate |  |  |  |  |  |  |  | 93,500,000 |  |  |  |  |  |
Other real estate equity investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  | 81,452,000 | $ 88,848,000 |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  |  |  |  |  | $ (5,212,000) | 36,842,000 | 2,869,000 |  |  |  |
Other real estate equity investments | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  |  | 31.00% |  |  |  |  |  |
Other real estate equity investments | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  |  | 70.00% |  |  |  |  |  |
Other real estate equity investments | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  | $ 16,600,000 | 13,800,000 |  |  |  |  |
Other real estate equity investments | Operating Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  | 11,100,000 | 13,200,000 |  |  |  |  |
iStar Net Lease I LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  | 69,096,000 | 125,360,000 |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  |  |  |  |  | 5,221,000 | 1,915,000 | 0 |  |  |  |
Distributions from other investments | $ 61,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total Revenue |  |  |  |  |  |  |  | 31,315,000 | 13,826,000 |  |  |  |  |
Net income attributable to LNR |  |  |  |  |  |  |  | 10,060,000 | 3,691,000 |  |  |  |  |
iStar Net Lease I LLC | Net Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 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 |  |  |  |  |  |  |  | 400,200,000 | 348,100,000 |  |  |  |  |
Management fees revenue |  |  |  |  |  |  |  | 1,500,000 | 1,300,000 |  |  |  |  |
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 |  |  |  |  |
Other investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  | 51,559,000 | 63,263,000 |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  |  |  |  |  | 9,434,000 | 38,385,000 | 23,810,000 |  |  |  |
Marina Palms |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  | 30,099,000 | 30,677,000 |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  |  |  |  |  | 23,626,000 | 14,671,000 | $ 45,000 |  |  |  |
iStar's ownership percentage |  |  |  |  |  | 47.50% |  |  |  | 47.50% |  |  |  |
Income from sales of real estate |  |  |  |  |  |  |  |  |  | $ 3,400,000 |  |  |  |
Total Revenue |  |  |  |  |  |  |  | 179,333,000 | 114,125,000 | 73,000 |  |  |  |
Net income attributable to LNR |  |  |  |  |  |  |  | 63,749,000 | 37,005,000 | (3,452,000) |  |  |  |
Marina Palms | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  |  |  | 278,500,000 | 265,700,000 |  |  |  |  |
Net proceeds from sales of real estate |  |  |  |  |  |  |  |  |  | 21,400,000 |  |  |  |
Madison Funds |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  | 21,966,000 | 45,971,000 |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  |  |  |  |  | $ (916,000) | 3,092,000 | $ 14,796,000 |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  |  | 29.50% |  |  |  |  |  |
Equity Method Investee |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  |  |  |  |  |  | $ 32,900,000 |  |  |  |  |
Equity Method Investee One |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investee | Investee |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Equity Method Investee Two |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  |  |  |  |  |  | $ 23,400,000 |  |  |  |  |
Equity Method Investee Two | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  | $ 6,300,000 | $ 9,400,000 |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  |  |  | 85.70% |  |  |  |  |
Loans receivable, commitments, related party |  |  |  |  |  |  |  | 45,700,000 |  |  |  |  |  |
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 |  |  |  |  |  |
Equity method Investee Three |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investee | Investee |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Oak Hill Funds Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  |  |  |  |  | $ 2,200,000 | $ 9,000,000 |  |  |  |  |
RCC | Operating Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Distributions from other investments |  |  |  |  |  |  |  | $ 21,000,000 |  |  |  |  |  |
Sales price of real estate held for investment |  |  |  |  |  |  |  | 68,500,000 |  |  |  |  |  |
Proceeds from sale of other real estate, net of equity contribution |  |  |  |  |  |  |  | 55,400,000 |  |  |  |  |  |
Contributions to other investments |  |  |  |  |  |  |  | $ 13,600,000 |  |  |  |  |  |
RCC | Operating Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Income from sales of real estate |  |  |  |  |  |  |  | $ 13,600,000 |  |  |  |  |  |
Sales price of real estate held for investment |  |  |  |  |  |  |  | 68,500,000 |  |  |  |  |  |
Real Estate Equity Investment Three |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  | 75.60% |  |  |  | 75.60% |  |  |  |
Real Estate Equity Investment Three | Net Lease |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  |  |  |  |  |  | $ 32,900,000 |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Proceeds from real estate and real estate joint ventures |  |  |  |  |  |  |  |  | $ 48,100,000 |  |  |  |  |
Real Estate Equity Investment Four | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  | 24,000,000 | $ 23,500,000 |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  |  |  | 15.70% |  |  |  |  |
Provision for (recovery of) loan losses |  |  |  |  |  |  |  |  | $ 2,800,000 |  |  |  |  |
Real Estate Equity Investment Five | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  | 13,500,000 | 21,100,000 |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  | 75.60% |  |  |  | 75.60% |  |  |  |
Real Estate Equity Investment Six | Land |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  |  |  |  | $ 9,900,000 | 7,800,000 |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  | 50.00% |  |  |  | 50.00% |  |  |  |
MIRELF III |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  |  | 32.90% |  |  |  |  |  |
MIRELF III AIV |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  |  | 32.90% |  |  |  |  |  |
Madison GP1 Investors LP |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  |  | 29.50% |  |  |  |  |  |
1000 SCI, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  | $ 3,900,000 | 600,000 |  |  |  |  |
Total Revenue |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Net income attributable to LNR |  |  |  |  |  |  |  | $ (367,000) |  |  |  |  |  |
LNR Property LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from equity method investments |  |  |  |  |  |  | $ 45,375,000 |  |  | $ 16,500,000 | $ 60,669,000 |  |  |
iStar's ownership percentage |  |  |  |  |  |  | 24.00% |  |  |  | 24.00% |  |  | 24.00%
Ownership percentage acquired by entity |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Contribution towards principal amount debt extinguished |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |
Equity method investment, aggregate cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 120,000,000
Net proceeds released from escrow |  |  |  |  |  |  |  |  |  |  |  | $ 25,200,000 |  |
Total Revenue |  |  |  |  |  |  | $ 179,373,000 |  |  |  | $ 332,902,000 |  |  |
Income tax (expense) benefit |  |  |  |  |  |  | (2,137,000) |  |  |  | (6,731,000) |  |  |
Net income attributable to LNR |  |  |  |  |  |  | 113,478,000 |  |  |  | 253,039,000 |  |  |
Operating cash flows |  |  |  |  |  |  | (127,075,000) |  |  |  | (85,909,000) |  |  |
Cash flows from investing activities |  |  |  |  |  |  | (36,543,000) |  |  |  | (55,686,000) |  |  |
Cash flows from financing activities |  |  |  |  |  |  | 217,241,000 |  |  |  | 229,634,000 |  |  |
Net cash flows |  |  |  |  |  |  | 53,623,000 |  |  |  | 88,039,000 |  |  |
Cash distributions |  |  |  |  |  |  | 0 |  |  |  | 61,179,000 |  |  |
Servicing fee revenue |  |  |  |  |  |  | 55,500,000 |  |  |  | 95,400,000 |  |  |
Other loss |  |  |  | $ (66,200,000) |  |  |  |  |  |  |  |  |  |
Carrying value of LNR at beginning of period |  | $ 220,281,000 |  | 220,281,000 | $ 205,773,000 | $ 0 |  |  | $ 0 | 205,773,000 |  |  |  |
Equity in earnings of LNR for the period |  |  |  | 0 | 45,375,000 | 0 |  |  |  | 45,375,000 |  |  |  |
Balance before other than temporary impairment |  |  |  | 220,281,000 | 251,148,000 | 0 |  |  |  | 251,148,000 |  |  |  |
Other than temporary impairment |  |  |  | 0 | (30,867,000) | 0 |  |  |  | (30,867,000) |  |  |  |
Sales proceeds pursuant to contract |  | $ (220,300,000) |  | (220,281,000) | 0 | 0 |  |  |  | (220,281,000) |  |  |  |
Carrying value of LNR at end of period |  |  |  | $ 0 | $ 220,281,000 | $ 0 |  |  |  | 0 |  |  |  |
Income (loss) from equity method investments, release of AOCI |  |  |  |  |  |  |  |  |  | $ 1,700,000 |  |  |  |
Distributions from operations of other investments |  |  |  |  |  |  | $ 0 |  |  |  | $ 14,690,000 |  |  |

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