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Debt Obligations, net (Debt Covenants) (Details)	9 Months Ended
	Sep. 30, 2014
Unsecured Credit Facilities
Debt Instrument [Line Items]
Minimum ratio of unencumbered assets to unsecured indebtedness	1.2
Total secured credit facilities and term loans
Debt Instrument [Line Items]
Multiple of the minimum collateral coverage on outstanding borrowings	1.25
Percentage of REIT taxable income permitted for distribution under debt covenants	100.00%

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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Period Type:	instant

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

Name:	star_DebtInstrumentCovenantPercentageOfTaxableIncomePermittedForDistributionIfReitClassificationIsMaintained
Namespace Prefix:	star_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

Name:	star_DebtInstrumentCovenantRatioOfUnencumberedAssetsToUnsecuredIndebtedness
Namespace Prefix:	star_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Balance Type:	na
Period Type:	duration