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Other Investments (Schedule of Other Investments) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Apr. 19, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jul. 28, 2010
Schedule of Equity Method Investments [Line Items]            
Equity method investments   $ 338,930us-gaap_EquityMethodInvestments $ 197,307us-gaap_EquityMethodInvestments      
Other, carrying value   15,189star_CostMethodInvestmentsandMarketableSecurities 9,902star_CostMethodInvestmentsandMarketableSecurities      
Other investments   354,119us-gaap_OtherInvestments 207,209us-gaap_OtherInvestments      
Earnings (loss) from equity method investments   94,905us-gaap_IncomeLossFromEquityMethodInvestments 41,520us-gaap_IncomeLossFromEquityMethodInvestments 103,009us-gaap_IncomeLossFromEquityMethodInvestments    
Real estate equity investments            
Schedule of Equity Method Investments [Line Items]            
Equity method investments   244,886us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_RealEstateEquityInvestmentsMember
62,205us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_RealEstateEquityInvestmentsMember
     
Earnings (loss) from equity method investments   53,428us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_RealEstateEquityInvestmentsMember
2,753us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_RealEstateEquityInvestmentsMember
21,636us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_RealEstateEquityInvestmentsMember
   
Other Equity Method Investee One            
Schedule of Equity Method Investments [Line Items]            
Earnings (loss) from equity method investments   23,400us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OtherEquityMethodInvesteeOneMember
       
Other equity method investments            
Schedule of Equity Method Investments [Line Items]            
Equity method investments   30,415us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OtherEquityMethodInvestmentsMember
45,954us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OtherEquityMethodInvestmentsMember
     
Earnings (loss) from equity method investments   35,172us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OtherEquityMethodInvestmentsMember
[1],[2] 3,332us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OtherEquityMethodInvestmentsMember
4,614us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OtherEquityMethodInvestmentsMember
   
Madison Funds            
Schedule of Equity Method Investments [Line Items]            
Equity method investments   45,971us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonFundsMember
67,782us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonFundsMember
     
Earnings (loss) from equity method investments   3,092us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonFundsMember
14,796us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonFundsMember
10,246us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonFundsMember
   
Oak Hill Funds            
Schedule of Equity Method Investments [Line Items]            
Equity method investments   17,658us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OakHillFundsMember
21,366us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OakHillFundsMember
     
Earnings (loss) from equity method investments   3,213us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OakHillFundsMember
4,174us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OakHillFundsMember
5,844us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OakHillFundsMember
   
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
[3]       24.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember
[3] 24.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember
Equity method investments   0us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember
0us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember
     
Earnings (loss) from equity method investments 45,375us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember
[3] 0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember
16,465us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember
60,669us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember
60,669us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_LnrPropertyLlcMember
[3]  
Other Equity Method Investee            
Schedule of Equity Method Investments [Line Items]            
Earnings (loss) from equity method investments   9,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_OtherEquityMethodInvesteeTwoMember
       
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   200us-gaap_EquityMethodInvestments
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_RealEstateEquityInvestmentThreeMember
16,400us-gaap_EquityMethodInvestments
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_RealEstateEquityInvestmentThreeMember
     
Earnings (loss) from equity method investments   $ 33,300us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_RealEstatePropertiesAxis
= star_NetLeaseAssetMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_RealEstateEquityInvestmentThreeMember
       
[1] In conjunction with the sale of the Company's interests in Oak Hill Advisors, L.P. in 2011, the Company retained interests in its share of carried interest related to various funds. During the year ended December 31, 2014, the Company recognized $9.0 million of carried interest income.
[2] During the year ended December 31, 2014, the Company recognized $23.4 million of earnings from equity method investments resulting from asset sales and a legal settlement by one of its equity method investees.
[3] 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.