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Loans Receivable and Other Lending Investments, net (Troubled Debt Restructurings) (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) Loan
TDR 1 [Line Items] |  |
Financing receivable, pre modification recorded investment | $ 11,600,000 | $ 7,000,000
Finance receivable, troubled loans | Loan |  | 1
Unfunded commitments, troubled debt restructurings | 0 |
Individually Evaluated for Impairment |  |
TDR 1 [Line Items] |  |
Financing receivable, pre modification recorded investment | $ 5,800,000 |

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

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
- 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: | debit
Period Type: | duration

X
- Definition [Line Items] for TDR 1 [Table] + References No definition available. + Details
Name: | star_TDR1LineItems
Namespace Prefix: | star_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | star_EvaluationTypeAxis=star_IndividuallyEvaluatedforImpairmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |