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Equity (Details 2) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012
HPU |
Stock Performance Award Program [Line Items] |
Number of votes per share | 0.25
High Performance Unit Program |
Stock Performance Award Program [Line Items] |
Initial purchase price of high performance units | 9.8
Number of plans which did not meet the required performance thresholds | 4
High Performance Unit Program | Employee |
Stock Performance Award Program [Line Items] |
Number of plans which have exceeded performance thresholds | 3
High Performance Unit Program 2002 Plan | Employee | HPU |
Stock Performance Award Program [Line Items] |
Number of shares of entity's common stock used as the basis for determining amount of distributions to be paid | 819,254
Number of shares outstanding (in shares) | 5,000
High Performance Unit Program 2003 Plan | Employee | HPU |
Stock Performance Award Program [Line Items] |
Number of shares of entity's common stock used as the basis for determining amount of distributions to be paid | 987,149
Number of shares outstanding (in shares) | 5,000,000
High Performance Unit Program 2004 Plan | Employee | HPU |
Stock Performance Award Program [Line Items] |
Number of shares of entity's common stock used as the basis for determining amount of distributions to be paid | 1,031,875
Number of shares outstanding (in shares) | 5,000,000

X
- Definition Represents the number of shares of the entity's common stock which are used as the basis for determining the amount of distributions to be paid to the holders of the stock performance awards. + References No definition available. + Details
Name: | sfi_StockPerformanceAwardCommonStockSharesBasisForDistributionCalculation
Namespace Prefix: | sfi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the initial purchase price HPU holders acquired their interests in High Performance Common Stock. + References No definition available. + Details
Name: | sfi_StockPerformanceAwardInitialPurchasePriceOfParticipantInterest
Namespace Prefix: | sfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the number of High Performance programs which did not meet performance thresholds and were not funded. + References No definition available. + Details
Name: | sfi_StockPerformanceAwardNumberOfPlansWhichDidNotMeetPerformanceThresholds
Namespace Prefix: | sfi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of High Performance programs which have exceed the performance thresholds and are funded. + References No definition available. + Details
Name: | sfi_StockPerformanceAwardNumberOfPlansWhichExceededPerformanceThresholds
Namespace Prefix: | sfi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of votes per stock performance award. + References No definition available. + Details
Name: | sfi_StockPerformanceAwardNumberOfVotingRightsPerShare
Namespace Prefix: | sfi_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Represents the number of High Performance Common Stock shares outstanding in the plan. + References No definition available. + Details
Name: | sfi_StockPerformanceAwardSharesOutstandingNumber
Namespace Prefix: | sfi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant