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Debt Obligations, net (Secured Credit Facility Narrative) (Details) (USD $)	3 Months Ended			1 Months Ended	36 Months Ended
	Mar. 31, 2015		Mar. 31, 2014	Mar. 31, 2012 tranches	Mar. 31, 2015	Mar. 27, 2015
Line of Credit Facility [Line Items]
Repayment of principal amount	$ 12,328,000us-gaap_RepaymentsOfDebt		$ 60,863,000us-gaap_RepaymentsOfDebt
Loss on early extinguishment of debt, net	168,000us-gaap_GainsLossesOnExtinguishmentOfDebt		1,180,000us-gaap_GainsLossesOnExtinguishmentOfDebt
2012 Secured Credit Facilities
Line of Credit Facility [Line Items]
Debt instrument, face amount				880,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilities2012Member
Number of tranches				2star_NumberOfTranchesUnderTermLoans / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilities2012Member
2012 Tranche A-1 Facility
Line of Credit Facility [Line Items]
Debt instrument, face amount				410,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesTrancheA1FacilityDueMarch2016Member
Variable interest rate, basis	LIBOR
Percentage of par credit facilities were issued at				98.00%star_LineOfCreditFacilityIssuePriceAsPercentageOfPrincipalAmount / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesTrancheA1FacilityDueMarch2016Member
Variable interest rate, spread	4.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesTrancheA1FacilityDueMarch2016Member
Unsecured Notes LIBOR plus 0.50% senior convertible notes
Line of Credit Facility [Line Items]
Repayment of principal amount				606,700,000us-gaap_RepaymentsOfDebt / us-gaap_LongtermDebtTypeAxis = star_UnsecuredNotesLiborPlusPoint50PercentSeniorConvertibleNotesDueOctober2012Member
Unsecured Line of credit due June 2012
Line of Credit Facility [Line Items]
Repayment of principal amount				244,000,000us-gaap_RepaymentsOfDebt / us-gaap_LongtermDebtTypeAxis = star_UnsecuredCreditFacilityLineOfCreditJune2012Member
Unsecured Notes 5.50% senior notes
Line of Credit Facility [Line Items]
Repayment of principal amount				90,300,000us-gaap_RepaymentsOfDebt / us-gaap_LongtermDebtTypeAxis = star_UnsecuredNotes5Point50PercentSeniorNotesDueJune2012Member
Stated Interest Rates				5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = star_UnsecuredNotes5Point50PercentSeniorNotesDueJune2012Member
2012 Tranche A-2 Facility
Line of Credit Facility [Line Items]
Debt instrument, face amount				470,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member
Repayment of principal amount					121,800,000us-gaap_RepaymentsOfDebt / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member
Stated Interest Rates	7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member				7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member
Loss on early extinguishment of debt, net	200,000us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member		300,000us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member
Variable interest rate, basis	LIBOR	[1]
Percentage of par credit facilities were issued at				98.50%star_LineOfCreditFacilityIssuePriceAsPercentageOfPrincipalAmount / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member
Variable interest rate, spread	5.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member	[1]
2015 Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity						$ 250,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilityRevolverDueMarch2018Member
Converted term loan, term	1 year
Minimum | 2012 Tranche A-2 Facility
Line of Credit Facility [Line Items]
Variable interest rate, spread	1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesTrancheA2FacilityDueMarch2017Member / us-gaap_RangeAxis = us-gaap_MinimumMember
London Interbank Offered Rate (LIBOR) | Minimum | 2012 Tranche A-1 Facility
Line of Credit Facility [Line Items]
Variable interest rate, spread	1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesTrancheA1FacilityDueMarch2016Member / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember
[1] The loan has a LIBOR floor of 1.25%. As of March 31, 2015, inclusive of the floor, the 2012 Tranche A-2 Facility loan incurred interest at a rate of 7.00%.

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Face (par) amount of debt instrument at time of issuance.

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-SubTopic 30

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Contractual interest rate for funds borrowed, under the debt agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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