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Summary of Treasury Stock Activity (Parenthetical) (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Treasury Stock [Line Items] |  |  |
Common stock repurchased value as result of restricted stock forfeitures and canceled | $ 0.001 | $ 0.001 | $ 0.001
Minimum |  |  |
Schedule of Treasury Stock [Line Items] |  |  |
Market Value of Restricted Shares | 29.17 | 29.17 | 29.17
Maximum |  |  |
Schedule of Treasury Stock [Line Items] |  |  |
Market Value of Restricted Shares | $ 44.67 | $ 44.67 | $ 44.67

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- Definition Common stock repurchased value as result of restricted stock forfeitures and canceled. + References No definition available. + Details
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