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Real estate (Details 8) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Real Estate Properties [Line Items] |  |  |  |  |
Real estate available and held for sale | $ 524,092,000 |  | $ 524,092,000 |  | $ 635,865,000
Income from sales of residential property | 34,319,000 | 13,266,000 | 58,016,000 | 19,999,000 |
Residential Operating Properties |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real estate available and held for sale | 298,800,000 |  | 298,800,000 |  | 374,100,000
Condominium Units |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of condominium units sold | 103 | 168 | 199 | 262 |
Income from sales of residential property | 30,900,000 | 13,300,000 | 54,600,000 | 20,000,000 |
Land |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Real estate available and held for sale | 179,827,000 |  | 179,827,000 |  | 181,278,000
Net Lease Assets |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Gain (loss) on sale of leased assets, net, operating leases, sale carve out |  |  | 3,400,000 | 2,400,000 |
Real estate available and held for sale | $ 8,694,000 |  | $ 8,694,000 |  | $ 0

X
- Definition Gain (Loss) on Sale of Leased Assets, Net, Operating Leases, Sale Carve Out + References No definition available. + Details
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Namespace Prefix: | sfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of Condominium Units Sold + References No definition available. + Details
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Namespace Prefix: | sfi_
Data Type: | xbrli:integerItemType
Balance Type: | na
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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
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Namespace Prefix: | sfi_
Data Type: | xbrli:monetaryItemType
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X
- Definition The gain resulting from the sale or other disposition of residential properties or components of those assets during the period. + References No definition available. + Details
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Namespace Prefix: | sfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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