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Commitments and Contingencies (Unfunded Commitments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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

X

- 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

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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

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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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Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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- Details

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- Details

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X

- Details

Name:	star_UnfundedFinancialCommitmentsAxis=us-gaap_OtherInvestmentsMember
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X

- Details

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