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Other Investments (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 341,549,000us-gaap_EquityMethodInvestments   $ 354,119,000us-gaap_EquityMethodInvestments
Proceeds from Sale of Available-for-sale Securities, Equity 7,300,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity    
Available-for-sale Securities, Gross Realized Gain (Loss) 2,500,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet    
Marina Palms      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 35,197,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember
  30,677,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember
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
   
Net Lease Venture      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 124,464,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_IStarNetLeaseILLCMember
  125,361,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_IStarNetLeaseILLCMember
Madison International Real Estate Fund IILP [Member]      
Schedule of Equity Method Investments [Line Items]      
iStar's ownership percentage 29.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonInternationalRealEstateFundIilpMember
   
Net Lease Asset One | Net Lease Venture      
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 | Marina Palms      
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 investment, preferred interest 10,000,000star_EquityMethodInvestmentPreferredInterest
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember
   
Total assets 275,800,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember
  265,700,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember
Land | Other real estate equity investments      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 73,700,000us-gaap_EquityMethodInvestments
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OtherRealEstateEquityInvestmentsMember
  75,500,000us-gaap_EquityMethodInvestments
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OtherRealEstateEquityInvestmentsMember
Net Lease      
Schedule of Equity Method Investments [Line Items]      
Net proceeds from sales of real estate   7,800,000us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
 
Net Lease | Net Lease Venture      
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
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   93,700,000us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_IStarNetLeaseILLCMember
 
Total assets 346,800,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_IStarNetLeaseILLCMember
  348,100,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ 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 $ 12,300,000us-gaap_EquityMethodInvestments
/ us-gaap_RealEstatePropertiesAxis
= star_OperatingPropertiesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OtherRealEstateEquityInvestmentsMember
  $ 13,200,000us-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 16.00%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 86.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OtherRealEstateEquityInvestmentsMember