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Additional Information On Non Vested Restricted Stock (Detail) (Restricted Stock Awards, USD $) In Millions, unless otherwise specified | Dec. 31, 2012 Y
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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 | $ 22.1
Weighted-average remaining vesting period | 1.86
Unrecognized compensation cost | $ 19.7

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