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Commitments and Contingencies - Fundings That May be Required (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2019 | Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract] |  |
Percentage of capital committed that may be drawn down |  | 100.00%
Other Commitments [Line Items] |  |
Performance-Based Commitments |  | $ 371,310
Strategic Investments |  | 24,177
Total |  | 395,487
Loans and Other Lending Investments |  |
Other Commitments [Line Items] |  |
Performance-Based Commitments |  | 294,059
Strategic Investments |  | 0
Total |  | 294,059
Real Estate |  |
Other Commitments [Line Items] |  |
Performance-Based Commitments |  | 77,251
Strategic Investments |  | 0
Total |  | 77,251
Other Investments |  |
Other Commitments [Line Items] |  |
Performance-Based Commitments |  | 0
Strategic Investments |  | 24,177
Total |  | 24,177
Loan Participations |  |
Other Commitments [Line Items] |  |
Performance-Based Commitments |  | $ 16,800
Bowling Entertainment Venue Operator | Bowling center commitment |  |
Other Commitments [Line Items] |  |
Commitment to invest additional bowling centers | $ 55,000 |

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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

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- 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

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

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

X
- 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
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | star_UnfundedFinancialCommitmentsAxis=us-gaap_LoansReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | star_UnfundedFinancialCommitmentsAxis=us-gaap_RealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | star_UnfundedFinancialCommitmentsAxis=us-gaap_OtherInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | star_UnfundedFinancialCommitmentsAxis=star_LoanParticipationsPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=star_BowlingEntertainmentVenueOperatorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=us-gaap_CapitalAdditionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |