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Real Estate (Real estate available and held for sale) (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 property | Dec. 31, 2012
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | $ 410,080,000 | $ 635,865,000
Land |  |
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | 147,748,000 | 181,278,000
Number of properties transferred from held for sale to held for use | 2 |
Property transferred from HFS, aggregate, carrying value | 49,700,000 |
Number of real estate properties transferred to held-for-sale | 2 |
Property transferred to held-for-sale, aggregate, carrying value | 19,800,000 |
Residential Operating Properties |  |
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | 252,900,000 | 374,100,000
Net Lease |  |
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | 0 | 0
Property transferred to held-for-sale, aggregate, carrying value | 18,500,000 |
Gain (loss) on real estate held for sale | $ 3,600,000 |

X
- Definition Gain (Loss) on Real Estate Held for Sale + References No definition available. + Details
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Namespace Prefix: | sfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of Properties Transferred from Held for Sale to Held for Use + References No definition available. + Details
Name: | sfi_NumberOfPropertiesTransferredFromHeldForSaleToHeldForUse
Namespace Prefix: | sfi_
Data Type: | xbrli:integerItemType
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- Definition Number of Real Estate Properties Transferred to Held for Sale + References No definition available. + Details
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Namespace Prefix: | sfi_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Property Transferred from HFS, Aggregate, Carrying Value + References No definition available. + Details
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Namespace Prefix: | sfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Property Transferred to Held for Sale, Aggregate, Carrying Value + References No definition available. + Details
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Namespace Prefix: | sfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, including real estate considered to be inventory of the entity. + References No definition available. + Details
Name: | sfi_RealEstateAvailableAndHeldForSale
Namespace Prefix: | sfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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