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Commitments and Contingencies (Details 2)	6 Months Ended
	Jun. 30, 2013
Unfunded Financial Commitments [Line Items]
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:	sfi_UnfundedFinancialCommitmentsLineItems
Namespace Prefix:	sfi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration