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Stock-Based Compensation Plans and Employee Benefits (Directors' Awards) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Restricted Stock Units (RSUs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted, Number of Shares | 306,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
Non-vested, outstanding (in shares) | 320,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 2,779,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Directors | Common Stock Equivalent |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted, Number of Shares | 8,602us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = star_CommonStockEquivalentMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = us-gaap_DirectorMember |
Directors | Restricted Stock Units (RSUs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Granted, Number of Shares | 39,570us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = us-gaap_DirectorMember |
Directors | CSE and restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options, grants in period, weighted average grant date fair value (per share) | 14.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = star_CseAndRestrictedStockAwardMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = us-gaap_DirectorMember |
Non-vested, outstanding (in shares) | 278,471us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = star_CseAndRestrictedStockAwardMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = us-gaap_DirectorMember |
Aggregate intrinsic value for directors | 3.8star_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueForDirectors / us-gaap_AwardTypeAxis = star_CseAndRestrictedStockAwardMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = us-gaap_DirectorMember |
Former director | CSE and restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares issued for settlement (in shares) | 55,076star_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesIssuedForSettlement / us-gaap_AwardTypeAxis = star_CseAndRestrictedStockAwardMember / star_ScheduleOfShareBasedCompensationArrangementByTitleOfIndividualAxis = star_FormerDirectorMember |

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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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- Definition The number of shares issued during the period to settle grants made on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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