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Basis of Presentation and Principles of Consolidation (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012 entity
Consolidated VIEs
Total revenues and total expenses related to consolidated VIEs
Number of variable interest entities (in investments)	5
Variable interest entity unfunded commitment	$ 67.0
Unconsolidated VIEs
Total revenues and total expenses related to consolidated VIEs
Number of variable interest entities (in investments)	27
Variable interest entity unfunded commitment	8.5
Carrying value of the investments	$ 153.1

X

- Definition

Represents the number of variable interest entities of the entity.

+ References

No definition available.

+ Details

Name:	sfi_VariableInterestEntityNumber
Namespace Prefix:	sfi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of unfunded commitments that the entity has to the Variable Interest Entity.

+ References

No definition available.

+ Details

Name:	sfi_VariableInterestEntityUnfundedCommitment
Namespace Prefix:	sfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_VariableInterestEntityMeasureOfActivityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Net carrying amount of the assets and liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), when the reporting entity is not the VIE's primary beneficiary.

+ References

No definition available.

+ Details

Name:	us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssetsAndLiabilitiesNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant