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Business and Organization (Details) (USD $) In Billions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013 decades
Business and Organization [Abstract] |
Investment across a range of real estate sectors over the past two decades (more than $35 billion at December 31, 2012) | $ 35
Period over which the entity has made the investment across a range of real estate (in decades) | 2

X
- Details
Name: | sfi_BusinessAndOrganizationAbstract
Namespace Prefix: | sfi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount invested across a range of real estate sectors by the entity over a period of time. + References No definition available. + Details
Name: | sfi_RealEstateInvestment
Namespace Prefix: | sfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the period over which the entity has invested across a range of real estate sectors. + References No definition available. + Details
Name: | sfi_RealEstateInvestmentPeriod
Namespace Prefix: | sfi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration