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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock option compensation | $ 4.9 | $ 3.0
Stock Options Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number exercisable and fully vested | 39,225 |
Fully vested stock options with performance conditions attached | 6,130 |
Stock option compensation | $ 4.9 | 3.0
Total intrinsic value exercised | 2.7 | 2.6
Total compensation cost related to non-vested stock options not yet recognized | $ 10.4 |
Expected compensation cost recognized over the weighted-average period | 1 year 11 months 4 days |
Stock Equivalent Units [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number exercisable and fully vested | 38,588 |
Fully vested stock options with performance conditions attached | 35,820 |
Total intrinsic value exercised | $ 6.8 | 2.4
Expected compensation cost recognized over the weighted-average period | 2 years 25 days |
Compensation cost | $ 14.0 | $ 7.9

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