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Real Estate (Impairments) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Real Estate [Abstract] |  |  |
Impairment of Long-Lived Assets Held-for-use and Sale Carve Out | $ 14.4 | $ 35.4 | $ 22.4
Impairment of Long-Lived Assets to be Disposed of or Sold | $ 1.8 | $ 22.6 | $ 9.1

X
- Definition Impairment of Long-Lived Assets Held-for-use and Sale Carve Out + References No definition available. + Details
Name: | star_ImpairmentOfLongLivedAssetsHeldForUseAndSaleCarveOut
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Impairment of Long-Lived Assets to be Disposed of or Sold + References No definition available. + Details
Name: | star_ImpairmentofLongLivedAssetstobeDisposedoforSold
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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