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Risk Management and Derivatives (Credit Risk-Related Contingent Features) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Forward Contracts
Derivative [Line Items]
Collateral posted for hedges	$ 1.0	$ 3.0

X

- Definition

Collateral Posted For Hedges

+ References

No definition available.

+ Details

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

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

X

- Details

Name:	us-gaap_DerivativeByNatureAxis=us-gaap_ForwardContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: