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Other Investments (LNR Property Narrative) (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2013 | Jul. 31, 2010 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2013 | Apr. 19, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Apr. 30, 2014 | Jul. 28, 2010
Equity Method Ownership Rollforward [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions from operations of equity method investments |  |  |  |  |  |  |  |  |  |  | $ 80,116,000us-gaap_EquityMethodInvestmentDividendsOrDistributions | $ 17,252,000us-gaap_EquityMethodInvestmentDividendsOrDistributions |  | $ 105,586,000us-gaap_EquityMethodInvestmentDividendsOrDistributions |  |  |  |
Earnings from equity method investments |  |  |  |  |  |  |  |  |  |  | 94,905,000us-gaap_IncomeLossFromEquityMethodInvestments | 41,520,000us-gaap_IncomeLossFromEquityMethodInvestments |  | 103,009,000us-gaap_IncomeLossFromEquityMethodInvestments |  |  |  |
LNR Property LLC (LNR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  |  |  | 24.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |  |  |  | 24.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  | 24.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember
Percentage of ownership acquired by the Company and a group of investors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%star_EquityMethodInvestmentOwnershipPercentageAcquiredByEntityAndGroupOfInvestors / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember
Contribution towards principal amount of Holdco Notes |  | 100,000,000star_PaymentsToAcquireEquityMethodInvestmentsContributionTowardsPrincipalAmountDebtExtinguished / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of cash contributed in exchange for equity interest |  | 100,000,000us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in investee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,000,000us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember
Real estate, net proceeds received from escrow |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,200,000star_RealEstateNetProceedsReleasedfromEscrow / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |
Equity Method Ownership Rollforward [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of LNR at beginning of period | 220,281,000star_EquityMethodInvestmentAmountQuarterLag / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  | 220,281,000star_EquityMethodInvestmentAmountQuarterLag / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  | 205,773,000star_EquityMethodInvestmentAmountQuarterLag / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  | 0star_EquityMethodInvestmentAmountQuarterLag / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  |  |  | 0star_EquityMethodInvestmentAmountQuarterLag / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | 205,773,000star_EquityMethodInvestmentAmountQuarterLag / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  |  |  |  |  |
Equity in earnings of LNR for the period |  |  | 0star_IncomeLossfromEquityMethodInvestmentsBeforeOtherthanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [2] | 45,375,000star_IncomeLossfromEquityMethodInvestmentsBeforeOtherthanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [2] | 0star_IncomeLossfromEquityMethodInvestmentsBeforeOtherthanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [2] |  |  |  | 45,375,000star_IncomeLossfromEquityMethodInvestmentsBeforeOtherthanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [2] |  |  |  |  |
Balance before other than temporary impairment |  |  | 220,281,000star_EquityMethodInvestmentCarryingValueBeforeOTTI / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  | 251,148,000star_EquityMethodInvestmentCarryingValueBeforeOTTI / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  | 0star_EquityMethodInvestmentCarryingValueBeforeOTTI / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  |  |  |  | 251,148,000star_EquityMethodInvestmentCarryingValueBeforeOTTI / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  |  |  |  |  |
Other than temporary impairment |  |  | 0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [2] | (30,867,000)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [2] | 0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [2] |  |  |  | (30,867,000)us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [2] |  |  |  |  |
Sales proceeds pursuant to contract | (220,300,000)us-gaap_EquityMethodInvestmentNetSalesProceeds / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  | (220,281,000)us-gaap_EquityMethodInvestmentNetSalesProceeds / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  | 0us-gaap_EquityMethodInvestmentNetSalesProceeds / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  | 0us-gaap_EquityMethodInvestmentNetSalesProceeds / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  |  |  |  | (220,281,000)us-gaap_EquityMethodInvestmentNetSalesProceeds / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  |  |  |  |  |
Carrying value of LNR at end of period |  |  | 0star_EquityMethodInvestmentAmountQuarterLag / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  | 220,281,000star_EquityMethodInvestmentAmountQuarterLag / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  | 0star_EquityMethodInvestmentAmountQuarterLag / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  |  |  |  | 0star_EquityMethodInvestmentAmountQuarterLag / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  | 205,773,000star_EquityMethodInvestmentAmountQuarterLag / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  |  |  |
Income (loss) from equity method investments, release of AOCI |  |  |  |  |  |  |  |  |  |  |  | 1,700,000star_IncomeLossfromEquityMethodInvestmentsReleaseofAOCI / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  |  |  |  |  |
Operating cash flows |  |  |  |  |  |  |  |  | (127,075,000)star_EquityMethodInvestmentSummarizedFinancialInformationOperatingCashFlows / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |  |  |  | (85,909,000)star_EquityMethodInvestmentSummarizedFinancialInformationOperatingCashFlows / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |
Cash flows from investing activities |  |  |  |  |  |  |  |  | (36,543,000)star_EquityMethodInvestmentSummarizedFinancialInformationCashFlowsfromInvesting / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |  |  |  | (55,686,000)star_EquityMethodInvestmentSummarizedFinancialInformationCashFlowsfromInvesting / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |
Cash flows from financing activities |  |  |  |  |  |  |  |  | 217,241,000star_EquityMethodInvestmentSummarizedFinancialInformationCashFlowsfromFinancing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |  |  |  | 229,634,000star_EquityMethodInvestmentSummarizedFinancialInformationCashFlowsfromFinancing / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |
Net cash flows |  |  |  |  |  |  |  |  | 53,623,000star_EquityMethodInvestmentSummarizedFinancialInformationNetCashFlows / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |  |  |  | 88,039,000star_EquityMethodInvestmentSummarizedFinancialInformationNetCashFlows / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |
Cash distributions |  |  |  |  |  |  |  |  | 0star_EquityMethodInvestmentSummarizedFinancialInformationCashDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |  |  |  | 61,179,000star_EquityMethodInvestmentSummarizedFinancialInformationCashDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |
Distributions from operations of equity method investments |  |  |  |  |  |  |  |  | 0us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |  |  |  | 14,690,000us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |
Equity method investment, summarized financial information, other loss |  |  | 66,200,000star_EquityMethodInvestmentSummarizedFinancialInformationOtherLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from equity method investments |  |  |  |  |  |  |  |  | 45,375,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] | 0us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | 16,465,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember |  | 60,669,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | 60,669,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyLlcMember | [1] |  |
LNR Property Corporation and Considered Variable Interest Entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing fee revenue |  |  |  |  |  |  |  |  | $ 55,500,000star_EquityMethodInvestmentServicingFeeRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyCorporationAndConsideredVariableInterestEntityMember |  |  |  |  |  | $ 95,400,000star_EquityMethodInvestmentServicingFeeRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_LnrPropertyCorporationAndConsideredVariableInterestEntityMember |  |  |
[1] | The Company recorded its investment in LNR, which was sold in April 2013, on a one quarter lag. Therefore, the amounts in the Company's financial statements for the year ended December 31, 2013 was based on balances and results from LNR for the period from October 1, 2012 to April 19, 2013. The amounts in the Company's financial statements for the year ended December 31, 2012 are based on the balances and results from LNR for the year ended September 30, 2012.
[2] | During the year ended December 31, 2013, the Company recorded an other than temporary impairment of $30.9 million. Subsequent to the sale of the Company's interest in LNR, LNR reported a reduction in their earnings of $66.2 million related to a purchase price allocation adjustment. The reduction was reflected in LNR's operations for the three months ended March 31, 2013, which resulted in a net loss for the period. Because the Company recorded its investment in LNR on a one quarter lag, the adjustment was reflected in the quarter ended June 30, 2013. There was no net impact on the Company's previously reported equity in earnings as the Company limited its proportionate share of earnings from LNR pursuant to the definitive sale agreement as described above.

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