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Share-based Compensation - Additional Information (Detail) - shares | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Shares issued under stock purchase plan, stock option exercises and restricted stock | 126,511 | 214,679

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- Definition Stock shares issued net of shares for tax withholdings. + References No definition available. + Details
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- References No definition available. + Details
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