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Additional Information With Respect To Non vested Options (Detail) (Employee Stock Option, USD $) In Millions, unless otherwise specified | Dec. 31, 2012 Y
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Employee Stock Option |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Aggregate intrinsic value | $ 2.2
Weighted-average remaining contractual term | 8.96
Weighted-average remaining expected term | 3.96
Weighted-average remaining vesting period | 1.87
Unrecognized compensation cost | $ 6.5

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