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Loans Receivable and Other Lending Investments, net (Troubled Debt Restructurings) (Details) $ in Millions	3 Months Ended
	Sep. 30, 2015 USD ($)
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 11.6
Individually Evaluated for Impairment
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 5.8

X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings before the financing receivable has been modified.

+ References

No definition available.

+ Details

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Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_FinancingReceivableImpairedLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	star_EvaluationTypeAxis=star_IndividuallyEvaluatedforImpairmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: