Debt Obligations, net (Debt Covenants) (Details) (USD $)	12 Months Ended
Dec. 31, 2013
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%
Aggregate equity value permitted to be distributed	$ 200,000,000

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.

No definition available.

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