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Debt Obligations, net (Schedule of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
May 31, 2013
Nov. 13, 2013
Jun. 10, 2014
Debt Instrument [Line Items]          
Total debt obligations $ 4,034,349us-gaap_DebtInstrumentCarryingAmount $ 4,196,589us-gaap_DebtInstrumentCarryingAmount      
Debt discounts, net (11,665)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet (38,464)us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet      
Total long-term debt obligations, net 4,022,684us-gaap_LongTermDebt 4,158,125us-gaap_LongTermDebt      
2012 Tranche A-2 Facility          
Debt Instrument [Line Items]          
Total debt obligations 358,504us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member		 [1] 431,475us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member		 [1]      
Stated interest rate 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member		        
Variable interest rate, spread 5.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member		 [1]        
Variable interest rate, basis LIBOR [1]        
February 2013 Secured Credit Facility          
Debt Instrument [Line Items]          
Total debt obligations 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_February2013SecuredCreditFacilityMember		 [2] 1,379,407us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_February2013SecuredCreditFacilityMember		 [2]      
Variable interest rate, spread 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= star_February2013SecuredCreditFacilityMember		 [2]        
Variable interest rate, basis LIBOR [2]        
Term loans collateralized by net lease assets          
Debt Instrument [Line Items]          
Total debt obligations 248,955us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredTermLoansCollateralizedByLoansNetLeaseAssetsDueThrough2026Member		 [3] 278,817us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredTermLoansCollateralizedByLoansNetLeaseAssetsDueThrough2026Member		 [3]      
Weighted average interest rate 5.30%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredTermLoansCollateralizedByLoansNetLeaseAssetsDueThrough2026Member		        
Stated interest rate, minimum 4.851%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredTermLoansCollateralizedByLoansNetLeaseAssetsDueThrough2026Member		 [3]        
Stated interest rate, maximum 7.26%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredTermLoansCollateralizedByLoansNetLeaseAssetsDueThrough2026Member		 [3]        
Total secured credit facilities and term loans          
Debt Instrument [Line Items]          
Total debt obligations 607,459us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredCreditFacilitiesMember		 2,089,699us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredCreditFacilitiesMember		      
Unsecured Notes 6.05% senior notes          
Debt Instrument [Line Items]          
Total debt obligations 105,765us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes6Point05PercentSeniorNotesDueApril2015Member		 105,765us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes6Point05PercentSeniorNotesDueApril2015Member		      
Stated interest rate 6.05%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes6Point05PercentSeniorNotesDueApril2015Member		        
Unsecured Notes 5.875% senior notes          
Debt Instrument [Line Items]          
Total debt obligations 261,403us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes5Point875PercentSeniorNotesDueMarch2016Member		 261,403us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes5Point875PercentSeniorNotesDueMarch2016Member		      
Stated interest rate 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes5Point875PercentSeniorNotesDueMarch2016Member		        
Unsecured Notes 3 point 875 Percent Senior Notes Due July 2016          
Debt Instrument [Line Items]          
Total debt obligations 265,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes3point875PercentSeniorNotesDueJuly2016Member		 265,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes3point875PercentSeniorNotesDueJuly2016Member		      
Stated interest rate 3.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes3point875PercentSeniorNotesDueJuly2016Member		   3.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes3point875PercentSeniorNotesDueJuly2016Member		    
Senior Convertible 3.0% notes          
Debt Instrument [Line Items]          
Total debt obligations 200,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_SeniorConvertibleThreePointZeroPercentNotesDueNovember2016Member		 [4] 200,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_SeniorConvertibleThreePointZeroPercentNotesDueNovember2016Member		 [4]      
Stated interest rate 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_SeniorConvertibleThreePointZeroPercentNotesDueNovember2016Member		 [4]        
Convertible debt conversion ratio 0.085us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_LongtermDebtTypeAxis
= star_SeniorConvertibleThreePointZeroPercentNotesDueNovember2016Member		        
Senior Convertible One Point 50 Percent Notes Due November 2016          
Debt Instrument [Line Items]          
Total debt obligations 200,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_SeniorConvertibleOnePoint50PercentNotesDueNovember2016Member		 [5] 200,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_SeniorConvertibleOnePoint50PercentNotesDueNovember2016Member		 [5]      
Stated interest rate 1.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_SeniorConvertibleOnePoint50PercentNotesDueNovember2016Member		 [5]     1.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_SeniorConvertibleOnePoint50PercentNotesDueNovember2016Member		  
Convertible debt conversion ratio 0.0578us-gaap_DebtInstrumentConvertibleConversionRatio1
/ us-gaap_LongtermDebtTypeAxis
= star_SeniorConvertibleOnePoint50PercentNotesDueNovember2016Member		        
Unsecured Notes 5.85% senior notes          
Debt Instrument [Line Items]          
Total debt obligations 99,722us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes5Point85PercentSeniorNotesDueMarch2017Member		 99,722us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes5Point85PercentSeniorNotesDueMarch2017Member		      
Stated interest rate 5.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes5Point85PercentSeniorNotesDueMarch2017Member		        
Unsecured Notes 9.0% senior notes          
Debt Instrument [Line Items]          
Total debt obligations 275,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesNinePercentSeniorNotesDueJune2017Member		 275,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesNinePercentSeniorNotesDueJune2017Member		      
Stated interest rate 9.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesNinePercentSeniorNotesDueJune2017Member		        
Unsecured Notes 4.00% Senior Notes Due November 2017          
Debt Instrument [Line Items]          
Total debt obligations 550,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesFourPercentSeniorNotesDueNovember2017Member		 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesFourPercentSeniorNotesDueNovember2017Member		      
Stated interest rate 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesFourPercentSeniorNotesDueNovember2017Member		       4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesFourPercentSeniorNotesDueNovember2017Member
Unsecured Notes 7.125% senior notes          
Debt Instrument [Line Items]          
Total debt obligations 300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesSevenPointOneTwoFivePercentSeniorNotesDueFebruary2018Member		 300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesSevenPointOneTwoFivePercentSeniorNotesDueFebruary2018Member		      
Stated interest rate 7.125%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesSevenPointOneTwoFivePercentSeniorNotesDueFebruary2018Member		        
Unsecured Notes 4 point 875 Percent Senior Notes Due July 2018          
Debt Instrument [Line Items]          
Total debt obligations 300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes4point875PercentSeniorNotesDueJuly2018Member		 300,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes4point875PercentSeniorNotesDueJuly2018Member		      
Stated interest rate 4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes4point875PercentSeniorNotesDueJuly2018Member		   4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotes4point875PercentSeniorNotesDueJuly2018Member		    
Unsecured Notes 5.00% Senior Notes Due July 2019          
Debt Instrument [Line Items]          
Total debt obligations 770,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesFivePercentSeniorNotesDueJuly2019Member		 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesFivePercentSeniorNotesDueJuly2019Member		      
Stated interest rate 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesFivePercentSeniorNotesDueJuly2019Member		       5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredNotesFivePercentSeniorNotesDueJuly2019Member
Unsecured Notes          
Debt Instrument [Line Items]          
Total debt obligations 3,326,890us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredSeniorNotesMember		 2,006,890us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_UnsecuredSeniorNotesMember		      
Other debt obligations due in October, 2035          
Debt Instrument [Line Items]          
Total debt obligations $ 100,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_OtherDebtSecuritiesDueOctober2035Member		 $ 100,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= star_OtherDebtSecuritiesDueOctober2035Member		      
Variable interest rate, spread 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= star_OtherDebtSecuritiesDueOctober2035Member		        
Variable interest rate, basis LIBOR        
Minimum | 2012 Tranche A-2 Facility          
Debt Instrument [Line Items]          
Variable interest rate, spread 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		        
Minimum | London Interbank Offered Rate (LIBOR) | February 2013 Secured Credit Facility          
Debt Instrument [Line Items]          
Variable interest rate, spread 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= star_February2013SecuredCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		        
Property One | London Interbank Offered Rate (LIBOR) | Term loans collateralized by net lease assets          
Debt Instrument [Line Items]          
Variable interest rate, spread 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredTermLoansCollateralizedByLoansNetLeaseAssetsDueThrough2026Member
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= star_PropertyOneMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		        
Property Two | London Interbank Offered Rate (LIBOR) | Term loans collateralized by net lease assets          
Debt Instrument [Line Items]          
Variable interest rate, spread 2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= star_SecuredTermLoansCollateralizedByLoansNetLeaseAssetsDueThrough2026Member
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= star_PropertyTwoMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember		        
[1] The loan has a LIBOR floor of 1.25%. As of December 31, 2014, inclusive of the floor, the 2012 Tranche A-2 Facility loan incurred interest at a rate of 7.00%.
[2] This loan had a LIBOR floor of 1.00%.
[3] As of December 31, 2014 and 2013, includes a loan with a floating rate of LIBOR plus 2.00%. As of December 31, 2013, includes a loan with a floating rate of LIBOR plus 2.75%. As of December 31, 2014, the weighted average interest rate of these loans is 5.3%.
[4] The Company's 3.0% senior convertible fixed rate notes due November 2016 ("3.0% Convertible Notes") are convertible at the option of the holders, into 85.0 shares per $1,000 principal amount of 3.0% Convertible Notes, at any time prior to the close of business on November 14, 2016.
[5] The Company's 1.50% senior convertible fixed rate notes due November 2016 ("1.50% Convertible Notes") are convertible at the option of the holders, into 57.8 shares per $1,000 principal amount of 1.50% Convertible Notes, at any time prior to the close of business on November 14, 2016.