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Additional Information on Non-vested Restricted Stock (Detail) (Restricted Stock Awards, USD $) In Millions, unless otherwise specified | Dec. 31, 2011 Year
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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 | $ 22.6
Weighted-average remaining vesting period | 1.90
Unrecognized compensation cost | $ 22.6

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