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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

X

- Definition

Impairment of Long-Lived Assets Held-for-use and Sale Carve Out

+ References

No definition available.

+ Details

Name:	sfi_ImpairmentOfLongLivedAssetsHeldForUseAndSaleCarveOut
Namespace Prefix:	sfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- Details

Name:	us-gaap_RealEstateAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration