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Real Estate (Impairments) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Real Estate [Abstract] |  |  |  |
Impairment of assets held for use and sale carve-outs | $ 6.8 | $ 5.0 | $ 7.2 | $ 29.1
Impairment of long-lived assets sale carve out | $ 0.5 | $ 4.8 | $ 0.9 | $ 21.4

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- Definition Impairment of Long-Lived Assets Held-for-use and Sale Carve Out + References No definition available. + Details
Name: | sfi_ImpairmentOfLongLivedAssetsHeldForUseAndSaleCarveOut
Namespace Prefix: | sfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Impairment of Long-Lived Assets Sale Carve Out + References No definition available. + Details
Name: | sfi_ImpairmentofLongLivedAssetsSaleCarveOut
Namespace Prefix: | sfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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