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Loans Receivable and Other Lending Investments, net (Troubled Debt Restructurings) (Details) | Jun. 30, 2015 USD ($)
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Receivables [Abstract] |
Unfunded commitments, troubled debt restructurings | $ 0

X
- Definition Represents the amount of the outstanding unfunded commitment related to financing receivables that has been modified by troubled debt restructurings. + References No definition available. + Details
Name: | star_FinancingReceivableModificationsUnfundedCommitments
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration