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Stock-Based Compensation Plans - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) Stock_Plan shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option compensation | $ 6.6 | $ 4.9 | $ 4.1
Accrued liabilities | $ 154.0 | 132.1 |
Stock Options Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration term for stock granted | 10 years |  |
Aggregate number of shares of common stock reserved for issuance which can be granted | shares | 2,550,000 |  |
Number of stock option plans | Stock_Plan | 2 |  |
Number exercisable and fully vested | shares | 41,525 |  |
Fully vested stock options with performance conditions attached | shares | 8,530 |  |
Stock option compensation | $ 6.6 | 4.9 | 4.2
Total intrinsic value exercised | 3.5 | 3.2 | 2.9
Total compensation cost related to non-vested stock options not yet recognized | $ 8.6 |  |
Expected compensation cost recognized over the weighted-average period | 1 year 9 months 3 days |  |
Current tax benefit related to stock option compensation | $ 1.5 | 1.2 |
Stock Options Plan [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock vesting period | 24 months |  |
Stock Options Plan [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock vesting period | 5 years |  |
Stock Equivalent Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration term for stock granted | 10 years |  |
Fully vested stock options with performance conditions attached | shares | 28,881 |  |
Total intrinsic value exercised | $ 7.3 | 2.7 | 1.7
Expected compensation cost recognized over the weighted-average period | 1 year 10 months 17 days |  |
Accrued liabilities | $ 24.6 |  |
Number of exercisable SEUs | shares | 31,649 |  |
Compensation cost | $ 20.1 | $ 5.7 | $ 6.6
Stock Equivalent Units [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock vesting period | 11 months |  |
Stock Equivalent Units [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock vesting period | 4 years |  |

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