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Real Estate (Real Estate Available and Held for Sale) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | $ 334,691 | $ 360,517
Residential Operating Properties |  |
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | 197,700 | 221,000
Land |  |
Real Estate Properties [Line Items] |  |
Real estate available and held for sale | $ 130,038 | $ 132,189

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- 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
Name: | star_RealEstateAvailableAndHeldForSale
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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