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Loans Receivable and Other Lending Investments, net (Troubled Debt Restructurings) (Details) (Senior mortgages, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2013 loans	Dec. 31, 2012 loans
Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	6	8
Pre-Modification Outstanding Recorded Investment	$ 179,030	$ 319,667
Post-Modification Outstanding Recorded Investment	$ 154,278	$ 272,753

X

- Definition

The number of financing receivables that have been modified by troubled debt restructurings.

+ References

No definition available.

+ Details

Name:	star_FinanceReceivableTroubledLoans
Namespace Prefix:	star_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

Name:	star_FinancingReceivablePostModificationRecordedInvestment
Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

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

Name:	star_FinancingReceivablePreModificationRecordedInvestment
Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Details

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