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Summary of Company's Treasure Stock Activity (Parenthetical) (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Common stock repurchased value as result of restricted stock forfeitures and canceled | $ 0.001 |
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Maximum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Market Value of Restricted Shares | $ 22.50 |
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Minimum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Market Value of Restricted Shares | $ 19.60 |
| X | ||||||||||
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- Definition
Common stock repurchased value as result of restricted stock forfeitures and canceled. No definition available.
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| X | ||||||||||
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- Definition
Market value per share of restricted shares withheld by company related to restricted stock vesting No definition available.
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| X | ||||||||||
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- Details
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