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Risk Management and Derivatives (Credit Risk-Related Contingent Features) (Details) (Forward Contracts, USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Forward Contracts
Derivative [Line Items]
Collateral Posted For Hedges	$ 3.0star_CollateralPostedForHedges / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember	$ 7.2star_CollateralPostedForHedges / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember

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

- Details

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