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Other Investments (Summarized financial information) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Apr. 19, 2013
Jul. 28, 2010
Equity Method Investments, Summarized Financial Information [Line Items]                
Revenues $ 626,039us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 284,513us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 401,870us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue          
Expenses (185,603)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses (77,633)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses (95,391)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses          
Net income attributable to parent entities 440,210us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss 206,198us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss 304,960us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss          
Equity Method Investments Excluding Lnr Property Corporation                
Equity Method Investments, Summarized Financial Information [Line Items]                
Total assets 3,464,984us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingLnrPropertyCorporationMember		 2,980,737us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingLnrPropertyCorporationMember		            
Total liabilities 479,298us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingLnrPropertyCorporationMember		 303,100us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingLnrPropertyCorporationMember		            
Noncontrolling interests 3,297us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingLnrPropertyCorporationMember		 333us-gaap_EquityMethodInvestmentSummarizedFinancialInformationMinorityInterest
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingLnrPropertyCorporationMember		            
Total equity 2,982,389us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingLnrPropertyCorporationMember		 2,677,304us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquityOrCapital
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingLnrPropertyCorporationMember		            
Alinda                
Equity Method Investments, Summarized Financial Information [Line Items]                
Revenues       233,130us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_AlindaInfrastructureFundIL.P.Member		 [1] 123,447us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_AlindaInfrastructureFundIL.P.Member		 [1] 104,364us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_AlindaInfrastructureFundIL.P.Member		 [1]    
Expenses       (15,433)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_AlindaInfrastructureFundIL.P.Member		 [1] (17,927)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_AlindaInfrastructureFundIL.P.Member		 [1] (16,934)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_AlindaInfrastructureFundIL.P.Member		 [1]    
Net income attributable to parent entities       217,697us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_AlindaInfrastructureFundIL.P.Member		 [1] 105,520us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_AlindaInfrastructureFundIL.P.Member		 [1] 87,430us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_AlindaInfrastructureFundIL.P.Member		 [1]    
iStar's ownership percentage 1.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_AlindaInfrastructureFundIL.P.Member		              
Marina Palms, LLC [Member]                
Equity Method Investments, Summarized Financial Information [Line Items]                
Revenues 114,125us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember		 73us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember		 [2]            
Expenses (77,120)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember		 (3,525)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember		 [2]            
Net income attributable to parent entities 37,005us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember		 (3,452)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember		 [2]            
iStar Net Lease I LLC [Member]                
Equity Method Investments, Summarized Financial Information [Line Items]                
Revenues 13,826us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_IStarNetLeaseILLCMember		 [3]              
Expenses (9,917)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_IStarNetLeaseILLCMember		 [3]              
Net income attributable to parent entities 3,691us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_IStarNetLeaseILLCMember		 [3]              
MIRELF III                
Equity Method Investments, Summarized Financial Information [Line Items]                
Revenues 20,293us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonInternationalLiquidityFundIIIandSubsidiariesMember		 19,460us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonInternationalLiquidityFundIIIandSubsidiariesMember		 13,490us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonInternationalLiquidityFundIIIandSubsidiariesMember		          
Expenses (1,401)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonInternationalLiquidityFundIIIandSubsidiariesMember		 (1,675)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonInternationalLiquidityFundIIIandSubsidiariesMember		 (3,894)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonInternationalLiquidityFundIIIandSubsidiariesMember		          
Net income attributable to parent entities 18,846us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonInternationalLiquidityFundIIIandSubsidiariesMember		 17,739us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonInternationalLiquidityFundIIIandSubsidiariesMember		 9,550us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonInternationalLiquidityFundIIIandSubsidiariesMember		          
iStar's ownership percentage 32.90%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonInternationalLiquidityFundIIIandSubsidiariesMember		              
MIRELF III AIV                
Equity Method Investments, Summarized Financial Information [Line Items]                
Revenues (1,194)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MIRELFIIIAIVLPandSubsidiariesMember		 26,348us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MIRELFIIIAIVLPandSubsidiariesMember		 (12,762)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MIRELFIIIAIVLPandSubsidiariesMember		          
Expenses (384)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MIRELFIIIAIVLPandSubsidiariesMember		 (1,167)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MIRELFIIIAIVLPandSubsidiariesMember		 (1,731)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MIRELFIIIAIVLPandSubsidiariesMember		          
Net income attributable to parent entities (1,578)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MIRELFIIIAIVLPandSubsidiariesMember		 25,181us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MIRELFIIIAIVLPandSubsidiariesMember		 (14,493)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MIRELFIIIAIVLPandSubsidiariesMember		          
iStar's ownership percentage 32.90%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MIRELFIIIAIVLPandSubsidiariesMember		              
Westgate                
Equity Method Investments, Summarized Financial Information [Line Items]                
Revenues 13,118us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OutletsatWestgateLLCMember		 12,447us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OutletsatWestgateLLCMember		 1,935us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OutletsatWestgateLLCMember		          
Expenses (9,618)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OutletsatWestgateLLCMember		 (8,889)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OutletsatWestgateLLCMember		 (2,202)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OutletsatWestgateLLCMember		          
Net income attributable to parent entities 3,500us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OutletsatWestgateLLCMember		 3,558us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OutletsatWestgateLLCMember		 (267)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OutletsatWestgateLLCMember		          
OHASCF                
Equity Method Investments, Summarized Financial Information [Line Items]                
Revenues 78,262us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OHAStrategicCreditMasterFundLPMember		 72,313us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OHAStrategicCreditMasterFundLPMember		 109,234us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OHAStrategicCreditMasterFundLPMember		          
Expenses (951)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OHAStrategicCreditMasterFundLPMember		 (1,642)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OHAStrategicCreditMasterFundLPMember		 (2,700)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OHAStrategicCreditMasterFundLPMember		          
Net income attributable to parent entities 77,311us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OHAStrategicCreditMasterFundLPMember		 70,671us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OHAStrategicCreditMasterFundLPMember		 106,534us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OHAStrategicCreditMasterFundLPMember		          
Moor Park                
Equity Method Investments, Summarized Financial Information [Line Items]                
Revenues 25,760us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MoorParkRealEstatePartnersIILPMember		 1,373us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MoorParkRealEstatePartnersIILPMember		 1,225us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MoorParkRealEstatePartnersIILPMember		          
Expenses (224)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MoorParkRealEstatePartnersIILPMember		 (304)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MoorParkRealEstatePartnersIILPMember		 (435)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MoorParkRealEstatePartnersIILPMember		          
Net income attributable to parent entities 25,536us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MoorParkRealEstatePartnersIILPMember		 1,069us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MoorParkRealEstatePartnersIILPMember		 790us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MoorParkRealEstatePartnersIILPMember		          
LNR Property LLC (LNR)                
Equity Method Investments, Summarized Financial Information [Line Items]                
Revenues           332,902us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember		 [4],[5] 179,373us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember		 [4],[5]  
Net income attributable to parent entities           253,039us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember		 [5],[6] 113,478us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember		 [5],[6]  
iStar's ownership percentage           24.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember		 [5] 24.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember		 [5] 24.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember
Other                
Equity Method Investments, Summarized Financial Information [Line Items]                
Revenues 128,719us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingSignificantSubsidiariesMember		 29,052us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingSignificantSubsidiariesMember		 184,384us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingSignificantSubsidiariesMember		          
Expenses (70,555)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingSignificantSubsidiariesMember		 (42,504)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingSignificantSubsidiariesMember		 (67,495)star_EquityMethodInvestmentSummarizedFinancialInformationCostsandExpenses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingSignificantSubsidiariesMember		          
Net income attributable to parent entities $ 58,202us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingSignificantSubsidiariesMember		 $ (14,088)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingSignificantSubsidiariesMember		 $ 115,416us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_EquityMethodInvestmentsExcludingSignificantSubsidiariesMember		          
[1] The Company recorded its 1% investment in Alinda on a quarter lag. Therefore, the amounts in the Company's financial statements for the years ended December 31, 2014, 2013 and 2012 were based on balances and results from Alinda for the years ended September 30, 2014, 2013 and 2012, respectively.
[2] The Company began accounting for its investment in Marina Palms under the equity method of accounting on April 17, 2013. The amounts in the Company's financial statements for the year ended December 31, 2013 are based on the balances and results from Marina Palms for the period from April 17, 2013 to December 31, 2013.
[3] The Company began accounting for its investment in Net Lease Venture under the equity method of accounting on February 13, 2014. The amounts in the Company's financial statements for the year ended December 31, 2014 are based on the balances and results from Net Lease Venture for the period from February 13, 2014 to December 31, 2014.
[4] LNR consolidates certain commercial mortgage-backed securities and collateralized debt obligation trusts that are considered VIEs (and for which it is the primary beneficiary), that have been included in the amounts presented above. Total revenue presented above includes $55.5 million and $95.4 million for the period from October 1, 2012 to April 19, 2013 and for the year ended September 30, 2012, respectively, of servicing fee revenue that is eliminated upon consolidation of the VIE's at the LNR level. This income is then added back through consolidation at the LNR level as an adjustment to income allocable to noncontrolling entities and has no net impact on net income attributable to LNR.
[5] 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.
[6] 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.