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Other Investments (Schedule of Other Investments) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 341,549us-gaap_EquityMethodInvestments   $ 354,119us-gaap_EquityMethodInvestments
Earnings (loss) from equity method investments 6,547us-gaap_IncomeLossFromEquityMethodInvestments 3,177us-gaap_IncomeLossFromEquityMethodInvestments  
Net Lease Venture      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 124,464us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_IStarNetLeaseILLCMember
  125,361us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_IStarNetLeaseILLCMember
Earnings (loss) from equity method investments 1,633us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_IStarNetLeaseILLCMember
(362)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_IStarNetLeaseILLCMember
 
Other real estate equity investments      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 86,166us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_RealEstateEquityInvestmentsMember
  88,848us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_RealEstateEquityInvestmentsMember
Earnings (loss) from equity method investments (1,302)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_RealEstateEquityInvestmentsMember
934us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_RealEstateEquityInvestmentsMember
 
Other Investments      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 50,725us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherInvestmentsMember
  63,262us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherInvestmentsMember
Earnings (loss) from equity method investments 1,733us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherInvestmentsMember
3,334us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= us-gaap_OtherInvestmentsMember
 
Madison Funds      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 44,997us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonFundsMember
  45,971us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonFundsMember
Earnings (loss) from equity method investments (37)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonFundsMember
(402)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MadisonFundsMember
 
Marina Palms      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 35,197us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember
  30,677us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember
Earnings (loss) from equity method investments $ 4,520us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember
$ (327)us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= star_MarinaPalmsLLCMember