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Share-based Compensation - Summary of Transactions for Non-Vested Stock Options (Detail) - 2007 and 2013 Plan - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Number of Shares, Non-vested options outstanding at beginning of period (shares) | 9,335 | 46,340 | 176,688
Number of Shares, Options vested (shares) | (9,335) | (37,005) | (130,223)
Number of Shares, Options forfeited (shares) | 0 | 0 | (125)
Number of Shares, Non-vested options outstanding at end of period (shares) | 0 | 9,335 | 46,340
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |
Weighted-Average Exercise Price Per Share, Non-vested options outstanding at beginning of period (in usd per share) | $ 23.47 | $ 22.42 | $ 19.13
Weighted-Average Exercise Price Per Share, Options vested (in usd per share) | 23.47 | 22.16 | 17.83
Weighted-Average Exercise Price Per Share, Options forfeited (in usd per share) | 0.00 | 0.00 | 144.00
Weighted-Average Exercise Price Per Share, Non-vested options outstanding at end of period (in usd per share) | $ 0.00 | $ 23.47 | $ 22.42

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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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- Details
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