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Commitments and Contingencies - Fundings That May be Required (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Percentage of capital committed that may be drawn down | 100.00%
Other Commitments [Line Items] |
Performance-Based Commitments | $ 126,051
Strategic Investments | 9,967
Total | 136,018
Loans and Other Lending Investments |
Other Commitments [Line Items] |
Performance-Based Commitments | 83,423
Strategic Investments | 0
Total | 83,423
Real Estate |
Other Commitments [Line Items] |
Performance-Based Commitments | 14,726
Strategic Investments | 0
Total | 14,726
Other Investments |
Other Commitments [Line Items] |
Performance-Based Commitments | 27,902
Strategic Investments | 9,967
Total | 37,869
Loan Participations |
Other Commitments [Line Items] |
Performance-Based Commitments | $ 8,000

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- Definition Represents the off-balance sheet maximum other commitments of the entity. + References No definition available. + Details
Name: | star_OtherCommitments
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
Name: | star_PercentageOfCapitalCommittedThatMayBeDrawnDown
Namespace Prefix: | star_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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
Name: | star_PerformanceBasedCommitments
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
Name: | star_UnfundedCommitments
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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

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

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