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Loans Receivable and Other Lending Investments, net (Troubled Debt Restructurings) (Details) (USD $)	Mar. 31, 2015
Receivables [Abstract]
Unfunded commitments, troubled debt restructurings	$ 0star_FinancingReceivableModificationsUnfundedCommitments

X

- Definition

Represents the amount of the outstanding unfunded commitment related to financing receivables that has been modified by troubled debt restructurings.

+ References

No definition available.

+ Details

Name:	star_FinancingReceivableModificationsUnfundedCommitments
Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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