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Commitments and Contingencies (Details 2) | 9 Months Ended
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Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract] |
Percentage of capital committed to strategic investments that may be drawn down | 100.00%

X
- Definition Represents the percentage of capital committed to strategic investments by the entity that may be drawn down. + References No definition available. + Details
Name: | sfi_PercentageOfCapitalCommittedThatMayBeDrawnDown
Namespace Prefix: | sfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration