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Stock-Based Compensation Plans - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock option compensation | $ 2.8 | $ 3.2
Stock Options Plan [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number exercisable and fully vested | 43,638 |
Fully vested stock options with performance conditions attached | 8,779 |
Stock option compensation | $ 2.8 | 3.2
Total intrinsic value exercised | 4.6 | 2.7
Total compensation cost related to non-vested stock options not yet recognized | $ 10.2 |
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] |  |
Fully vested stock options with performance conditions attached | 51,164 |
Total intrinsic value exercised | $ 6.1 | 7.1
Expected compensation cost recognized over the weighted-average period | 2 years 2 months 12 days |
Number of exercisable SEUs | 57,696 |
Compensation cost | $ 3.0 | $ 11.8

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