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Loans Receivable and Other Lending Investments, net (Troubled Debt Restructurings) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) loan | Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loans | loan | 2 |
Pre-modification outstanding recorded investment | $ 11,600,000 |
Unfunded commitments, troubled debt restructurings |  | $ 0
Individually Evaluated for Impairment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Pre-modification outstanding recorded investment | $ 5,800,000 |

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- 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_
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Balance Type: | na
Period Type: | duration

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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |