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Other Investments (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investments | $ 338,930,000us-gaap_EquityMethodInvestments |  | $ 197,307,000us-gaap_EquityMethodInvestments |  |  |
Earnings (loss) from equity method investments | 94,905,000us-gaap_IncomeLossFromEquityMethodInvestments |  | 41,520,000us-gaap_IncomeLossFromEquityMethodInvestments |  | 103,009,000us-gaap_IncomeLossFromEquityMethodInvestments |
Provision for (recovery of) loan losses | (1,714,000)us-gaap_ProvisionForLoanLossesExpensed | [1] | 5,489,000us-gaap_ProvisionForLoanLossesExpensed | [1] | 81,740,000us-gaap_ProvisionForLoanLossesExpensed | [1]
Net proceeds from sales of real estate | 419,527,000us-gaap_ProceedsFromSaleOfRealEstate |  | 437,817,000us-gaap_ProceedsFromSaleOfRealEstate |  | 562,705,000us-gaap_ProceedsFromSaleOfRealEstate |
Madison International Real Estate Fund IILP |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage | 29.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_MadisonInternationalRealEstateFundIilpMember |  |  |  |  |
MIRELF III |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage | 32.90%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_MadisonInternationalLiquidityFundIIIandSubsidiariesMember |  |  |  |  |
MIRELF III AIV |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage | 32.90%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_MIRELFIIIAIVLPandSubsidiariesMember |  |  |  |  |
Madison GP1 Investors LP |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage | 29.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_MadisonGp1InvestorsLpMember |  |  |  |  |
Oak Hill Funds Group 2 |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage | 5.90%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_OakHillFundsGroup2Member |  |  |  |  |
Net Lease Asset One |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net proceeds from sales of real estate | 7,800,000us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetOneMember |  |  |  |  |
Net Lease Asset One | iStar Net Lease I LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Net proceeds from sales of real estate | 93,700,000us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetOneMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember |  |  |  |  |
Land |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of properties acquired | 1star_NumberofPropertiesAcquired / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember |  |  |  |  |
Land | Real Estate Equity Investment Five |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage |  |  | 75.60%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentFiveMember |  |  |
Equity method investments | 21,100,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentFiveMember |  | 18,000,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentFiveMember |  |  |
Land | Real Estate Equity Investment Six |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentSixMember |  |  |
Equity method investments | 7,800,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentSixMember |  | 3,500,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentSixMember |  |  |
Land | Real Estate Equity Investment Two |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage | 85.70%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentTwoMember |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentTwoMember |  |  |
Equity method investments | 9,400,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentTwoMember |  |  |  |  |
Loans receivable, commitments, related party | 45,700,000star_LoansReceivableCommitmentsRelatedParty / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentTwoMember |  |  |  |  |
Land | Real Estate Equity Investment Four |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage | 15.70%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentFourMember |  |  |  |  |
Equity method investments | 23,500,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentFourMember |  |  |  |  |
Provision for (recovery of) loan losses | 2,800,000us-gaap_ProvisionForLoanLossesExpensed / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentFourMember |  |  |  |  |
Land | Other real estate equity investments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investments | 13,800,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_OtherRealEstateEquityInvestmentsMember |  | 2,700,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_OtherRealEstateEquityInvestmentsMember |  |  |
Land | Marina Palms, LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage |  |  | 47.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_MarinaPalmsLLCMember |  |  |
Equity method investments | 30,700,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_MarinaPalmsLLCMember |  | 5,500,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_MarinaPalmsLLCMember |  |  |
Earnings (loss) from equity method investments | 14,700,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_MarinaPalmsLLCMember |  |  |  |  |
Net proceeds from sales of real estate |  |  | 21,400,000us-gaap_ProceedsFromSaleOfRealEstate / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_MarinaPalmsLLCMember |  |  |
Equity method investment, carryover basis |  |  | 10,600,000star_EquityMethodInvestmentCarryoverBasis / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_MarinaPalmsLLCMember |  |  |
Equity method investment, preferred interest | 10,000,000star_EquityMethodInvestmentPreferredInterest / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_MarinaPalmsLLCMember |  | 6,600,000star_EquityMethodInvestmentPreferredInterest / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_MarinaPalmsLLCMember |  |  |
Net Lease | Real Estate Equity Investment Three |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentThreeMember |  |  |  |  |
Equity method investments | 200,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentThreeMember |  | 16,400,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentThreeMember |  |  |
Proceeds from real estate and real estate joint ventures | 48,100,000us-gaap_ProceedsFromRealEstateAndRealEstateJointVentures / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentThreeMember |  |  |  |  |
Earnings (loss) from equity method investments | 33,300,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentThreeMember |  |  |  |  |
Net Lease | iStar Net Lease I LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage | 51.90%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember |  |  |  |  |
Partners' capital account, contributions | 500,000,000star_PartnersCapitalCommitment / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember |  |  |  |  |
Equity method investment, related party ownership percentage | 0.60%star_EquityMethodInvestmentRelatedPartyOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember |  |  |  |  |
Equity method investment, related party promote fee percentage | 50.00%star_EquityMethodInvestmentRelatedPartyPromoteFeePercentage / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember |  |  |  |  |
Equity method investment, partner ownership percentage | 47.50%star_EquityMethodInvestmentPartnerOwnershipPercentage / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember |  |  |  |  |
Net proceeds from sales of real estate | 10,100,000us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 72.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember |  |  |  |  |
Transfer mortgage payable | 26,000,000us-gaap_TransferMortgagePayable / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember |  |  |  |  |
Number of properties acquired | 58star_NumberofPropertiesAcquired / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember |  |  |  |  |
Acquisitions of real estate assets | 200,000,000star_PaymentstoAcquireRealEstatebyEquityMethodInvestee / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember |  |  |  |  |
Total assets | 348,100,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember |  |  |  |  |
Equity method investments | 125,400,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = star_NetLeaseAssetMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_IStarNetLeaseILLCMember |  |  |  |  |
Operating Properties | Other real estate equity investments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investments | 13,200,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = star_OperatingPropertiesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_OtherRealEstateEquityInvestmentsMember |  | 16,000,000us-gaap_EquityMethodInvestments / us-gaap_RealEstatePropertiesAxis = star_OperatingPropertiesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_OtherRealEstateEquityInvestmentsMember |  |  |
Minimum | Other real estate equity investments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage | 31.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_OtherRealEstateEquityInvestmentsMember |  |  |  |  |
Maximum | Other real estate equity investments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
iStar's ownership percentage | 70.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_OtherRealEstateEquityInvestmentsMember |  |  |  |  |
Loans Receivable and Other Lending Investments, Net | Land | Real Estate Equity Investment Two |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Payments for funding under loan commitments | $ 14,600,000star_LoansReceivableRelatedParty / us-gaap_BalanceSheetLocationAxis = star_LoansReceivableandOtherLendingInvestmentsNetMember / us-gaap_RealEstatePropertiesAxis = us-gaap_LandMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = star_RealEstateEquityInvestmentTwoMember |  |  |  |  |
[1] | For the years ended December 31, 2014, 2013 and 2012, the provision for loan losses includes recoveries of previously recorded loan loss reserves of $10.1 million, $63.1 million and $4.6 million, respectively.

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