XML 114 R87.htm IDEA: XBRL DOCUMENT v3.8.0.1

Commitments and Contingencies (Unfunded Commitments) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
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	$ 377,809
Strategic Investments	10,743
Total	388,552
Loans and Other Lending Investments
Unfunded Financial Commitments [Line Items]
Performance-Based Commitments	338,290
Strategic Investments	0
Total	338,290
Real Estate
Unfunded Financial Commitments [Line Items]
Performance-Based Commitments	10,934
Strategic Investments	0
Total	10,934
Other Investments
Unfunded Financial Commitments [Line Items]
Performance-Based Commitments	28,585
Strategic Investments	10,743
Total	39,328
Loan Participations Payable
Unfunded Financial Commitments [Line Items]
Performance-Based Commitments	$ 102,100

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

X

- References

No definition available.

+ Details

Name:	star_UnfundedFinancialCommitmentsLineItems
Namespace Prefix:	star_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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: