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Real estate (Details 5) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2012
Real Estate [Abstract] |  |  |
Impairment of assets held for use and sale carve-outs | $ 0.4 | $ 7.5 | $ 23.5
Impairment of long-lived assets sale carve out |  | $ 1.3 | $ 16.6

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- Definition Impairment of Long-Lived Assets Held-for-use and Sale Carve Out + References No definition available. + Details
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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