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Additional Information on Non Vested Restricted Stock (Detail) (Restricted Stock Awards, USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Restricted Stock Awards |
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other Than Options Restricted Stock Units [Line Items] |
Aggregate intrinsic value | $ 23.2 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Weighted-average remaining vesting period | 1 year 9 months 29 days
Unrecognized compensation cost | $ 29.0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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- Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options nonvested weighted average remaining vesting term + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options. + References No definition available. + Details
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