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Loans Receivable and Other Lending Investments, net (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 loans | Mar. 31, 2013 loans
Performing senior mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans |  | 1
Senior mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | 0 | 1
Pre-Modification Outstanding Recorded Investment | $ 0 | $ 72,674
Post-Modification Outstanding Recorded Investment | $ 0 | $ 65,000

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 after the financing receivable has been modified. + References No definition available. + Details
Name: | star_FinancingReceivablePostModificationRecordedInvestment
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
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 before the financing receivable has been modified. + References No definition available. + Details
Name: | star_FinancingReceivablePreModificationRecordedInvestment
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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