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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.

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