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Debt Obligations, net (Debt Covenants) (Details)	3 Months Ended
	Mar. 31, 2015
Unsecured Credit Facilities
Debt Instrument [Line Items]
Minimum ratio of unencumbered assets to unsecured indebtedness	1.2star_DebtInstrumentCovenantRatioOfUnencumberedAssetsToUnsecuredIndebtedness / us-gaap_LongtermDebtTypeAxis = star_UnsecuredCreditFacilitiesMember
Debt instrument covenant multiple of minimum fixed charges on outstanding borrowings	1.5star_DebtInstrumentCovenantMultipleofMinimumFixedChargesonOutstandingBorrowings / us-gaap_LongtermDebtTypeAxis = star_UnsecuredCreditFacilitiesMember
2012 Secured Credit Facilities
Debt Instrument [Line Items]
Multiple of the minimum collateral coverage on outstanding borrowings	1.25star_DebtInstrumentCovenantMultipleofMinimumCollateralCoverageonOutstandingBorrowings / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilities2012Member
Total secured credit facilities and term loans
Debt Instrument [Line Items]
Percentage of REIT taxable income permitted for distribution under debt covenants	100.00%star_DebtInstrumentCovenantPercentageOfTaxableIncomePermittedForDistributionIfReitClassificationIsMaintained / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilitiesMember
2015 Revolving Credit Facility
Debt Instrument [Line Items]
Multiple of the minimum collateral coverage on outstanding borrowings	1.5star_DebtInstrumentCovenantMultipleofMinimumCollateralCoverageonOutstandingBorrowings / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilityRevolverDueMarch2018Member
Debt instrument covenant multiple of minimum fixed charges on outstanding borrowings	1.5star_DebtInstrumentCovenantMultipleofMinimumFixedChargesonOutstandingBorrowings / us-gaap_LongtermDebtTypeAxis = star_SecuredCreditFacilityRevolverDueMarch2018Member

X

- Definition

Represents the multiple of the minimum collateral coverage on outstanding borrowings required under the terms of the debt covenant.

+ References

No definition available.

+ Details

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X

- Definition

Debt Instrument Covenant Multiple of Minimum Fixed Charges on Outstanding Borrowings

+ References

No definition available.

+ Details

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X

- Definition

Represents the percentage of taxable income that is permitted for distribution, under the terms of the debt covenant, if the entity maintains its REIT qualification.

+ References

No definition available.

+ Details

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X

- Definition

Represents the minimum ratio of encumbered assets to unsecured indebtedness required under the terms of the debt covenant.

+ References

No definition available.

+ Details

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X

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X

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X

- Details

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X

- Details

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X

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