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Basis of Presentation and Principles of Consolidation (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 entity
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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