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Commitments and Contingencies (Unfunded Commitments) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract] |
Percentage of capital committed to strategic investments that may be drawn down | 100.00%star_PercentageOfCapitalCommittedThatMayBeDrawnDown
Unfunded Financial Commitments [Line Items] |
Performance-Based Commitments | $ 579,595star_PerformanceBasedCommitments
Strategic Investments | 45,714star_OtherCommitments
Discretionary Fundings | 5,000star_DiscretionaryFundings
Total | 630,309star_UnfundedCommitments
Loans and Other Lending Investments |
Unfunded Financial Commitments [Line Items] |
Performance-Based Commitments | 537,924star_PerformanceBasedCommitments / star_UnfundedFinancialCommitmentsAxis = us-gaap_LoansReceivableMember
Strategic Investments | 0star_OtherCommitments / star_UnfundedFinancialCommitmentsAxis = us-gaap_LoansReceivableMember
Discretionary Fundings | 5,000star_DiscretionaryFundings / star_UnfundedFinancialCommitmentsAxis = us-gaap_LoansReceivableMember
Total | 542,924star_UnfundedCommitments / star_UnfundedFinancialCommitmentsAxis = us-gaap_LoansReceivableMember
Real Estate |
Unfunded Financial Commitments [Line Items] |
Performance-Based Commitments | 14,667star_PerformanceBasedCommitments / star_UnfundedFinancialCommitmentsAxis = us-gaap_RealEstateMember
Strategic Investments | 0star_OtherCommitments / star_UnfundedFinancialCommitmentsAxis = us-gaap_RealEstateMember
Discretionary Fundings | 0star_DiscretionaryFundings / star_UnfundedFinancialCommitmentsAxis = us-gaap_RealEstateMember
Total | 14,667star_UnfundedCommitments / star_UnfundedFinancialCommitmentsAxis = us-gaap_RealEstateMember
Other Investments |
Unfunded Financial Commitments [Line Items] |
Performance-Based Commitments | 27,004star_PerformanceBasedCommitments / star_UnfundedFinancialCommitmentsAxis = us-gaap_OtherInvestmentsMember
Strategic Investments | 45,714star_OtherCommitments / star_UnfundedFinancialCommitmentsAxis = us-gaap_OtherInvestmentsMember
Discretionary Fundings | 0star_DiscretionaryFundings / star_UnfundedFinancialCommitmentsAxis = us-gaap_OtherInvestmentsMember
Total | $ 72,718star_UnfundedCommitments / star_UnfundedFinancialCommitmentsAxis = us-gaap_OtherInvestmentsMember

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- Definition Represents the off-balance sheet maximum amount of potential additional fundings which the entity will make available to a borrower or tenant for an expansion or addition to a project if it approves of the expansion or addition at its sole discretion. + References No definition available. + Details
Name: | star_DiscretionaryFundings
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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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- Details
Name: | star_UnfundedFinancialCommitmentsLineItems
Namespace Prefix: | star_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
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_OtherInvestmentsMember
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: |