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Real Estate (Allowance for doubtful accounts) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Real Estate [Abstract] |  |
Allowance for doubtful accounts related to real estate tenant receivables | $ 5.7 | $ 5.6

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- Definition Represents the allowance for doubtful accounts related to tenant receivables, including deferred operating lease income receivable. + References No definition available. + Details
Name: | sfi_AllowanceForDoubtfulAccountsRelatedToTenantReceivables
Namespace Prefix: | sfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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