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Business and Organization (Details) (USD $) In Billions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
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) | $ 35star_RealEstateInvestment

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- Details
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Namespace Prefix: | star_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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: | star_RealEstateInvestment
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration