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Stock Compensation - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | $ 11.1 | $ 10.1
Aggregate weighted-average grant-date fair value of units granted | 17.2 | 16.8
Total unrecognized compensation cost | $ 16.1 |
Unrecognized compensation cost, weighted-average recognition period | 2 years 1 month 6 days |
Aggregate weighted-average grant-date fair value of units vested | $ 13.0 | $ 14.8
Performance-Based Units | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares which will vest after achievement of goals (in shares) | 0 |
Performance-Based Units | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares which will vest after achievement of goals (in shares) | 2 |

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