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Stock-Based Compensation Plans and Employee Benefits (Directors' Awards) (Details) (Directors, CSE and restricted stock units, USD $) In Millions, except Share data, unless otherwise specified | Mar. 31, 2015
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Directors | CSE and restricted stock units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Non-vested, outstanding (in shares) | 278,471 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = star_CseAndRestrictedStockAwardMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = us-gaap_DirectorMember
Aggregate intrinsic value for directors | $ 3.6 star_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueForDirectors / us-gaap_AwardTypeAxis = star_CseAndRestrictedStockAwardMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = us-gaap_DirectorMember

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- Definition The aggregate intrinsic value of outstanding equity awards on equity-based plans excluding option plans for which the Company is contingently obligated to issue equity instruments or transfer assets to an director as calculated by applying the disclosed pricing methodology. + References No definition available. + Details
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Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration