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Commitments and Contingencies (Unfunded Commitments) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2019 | Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |  |
Percentage of capital committed to strategic investments that may be drawn down |  | 100.00%
Unfunded Financial Commitments [Line Items] |  |
Performance-Based Commitments |  | $ 427,027
Strategic Investments |  | 16,851
Total |  | 443,878
Loans and Other Lending Investments |  |
Unfunded Financial Commitments [Line Items] |  |
Performance-Based Commitments |  | 225,600
Strategic Investments |  | 0
Total |  | 225,600
Real Estate |  |
Unfunded Financial Commitments [Line Items] |  |
Performance-Based Commitments |  | 70,047
Strategic Investments |  | 0
Total |  | 70,047
Other Investments |  |
Unfunded Financial Commitments [Line Items] |  |
Performance-Based Commitments |  | 131,380
Strategic Investments |  | 16,851
Total |  | 148,231
Loan Participations Payable |  |
Unfunded Financial Commitments [Line Items] |  |
Performance-Based Commitments |  | 14,300
Bowling Center Commitment | Bowling Entertainment Venue Operator |  |
Unfunded Financial Commitments [Line Items] |  |
Commitment to invest additional bowling centers | $ 55,000 | $ 55,000

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- Definition Represents the off-balance sheet maximum other commitments of the entity. + References No definition available. + Details
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Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the percentage of capital committed to strategic investments by the entity that may be drawn down. + References No definition available. + Details
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Namespace Prefix: | star_
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X
- Definition Represents the off-balance sheet unfunded maximum amount of funds for construction and development loans and build-outs of space in net lease assets over a period of time if and when the borrowers and tenants meet established milestones and other performance criteria. + References No definition available. + Details
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Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents certain off-balance sheet unfunded commitments of the entity. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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