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Loans Receivable and Other Lending Investments, net (Troubled Debt Restructurings) (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 loans | Sep. 30, 2013 loans | Sep. 30, 2014 loans | Sep. 30, 2013 loans
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans |  |  |  | 5
Unfunded commitments, troubled debt restructurings | $ 0 |  | $ 0 |
Senior mortgages |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | 1 | 2 | 1 | 5
Pre-Modification Outstanding Recorded Investment | 7,040,000 | 9,020,000 | 7,040,000 | 153,452,000
Post-Modification Outstanding Recorded Investment | 7,040,000 | 9,020,000 | 7,040,000 | 145,778,000
Performing senior mortgages |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans |  | 1 |  | 1
Non-performing senior mortgages |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investment of loans whose maturity was extended |  | 7,600,000 |  |
Number of Loans | 1 |  | 1 | 1
Financing receivable modifications recorded investment of contracts whose maturity extended and reduced principal |  |  |  | 72,700,000
Repayment of debt |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investment of loans whose maturity was extended |  |  |  | 13,300,000
Nonperforming Financing Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investment of loans whose maturity was extended |  |  |  | 68,600,000
One Year Payment Extension | Performing senior mortgages |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investment of loans whose maturity was extended |  | 1,400,000 |  | 3,200,000
Finance Receivable, Trouble Debt Restructuring Time Period |  | 1 year |  | 1 year
One Year Payment Extension | Non-performing senior mortgages |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Recorded investment of loans whose maturity was extended | $ 7,000,000 |  | $ 7,000,000 |
Finance Receivable, Trouble Debt Restructuring Time Period | 1 year |  | 1 year |

X
- Definition Represents the weighted average maturity period of loans. + References No definition available. + Details
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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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Period Type: | duration

X
- Definition Represents the amount of the outstanding recorded investment related to financing receivables for which the maturity was extended and that has been modified by troubled debt restructurings. + References No definition available. + Details
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- Definition Recorded investment of financing Receivable whose maturity was extended and principal was reduced + References No definition available. + Details
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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
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Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
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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
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Namespace Prefix: | star_
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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
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Period Type: | duration

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- Details
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