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Loans Receivable and Other Lending Investments, net (Troubled Debt Restructuring Subsequently Defaulted) (Details) (Senior mortgages troubled debt restructurings, USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Dec. 31, 2013 loans | Dec. 31, 2012 loans
Senior mortgages troubled debt restructurings |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | 1 | 1
Outstanding Recorded Investment | $ 26,693 | $ 18,511

X
- Definition The number of financing receivables that have been modified by troubled debt restructurings. + References No definition available. + Details
Name: | star_FinanceReceivableTroubledLoans
Namespace Prefix: | star_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References No definition available. + Details
Name: | star_FinancingReceivableOutstandingRecordedInvestment
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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