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Stock Compensation - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | $ 5.1 | $ 4.7
Aggregate weighted-average grant-date fair value of units granted | 16.4 | 16.5
Total unrecognized compensation cost | $ 22.3 |
Unrecognized compensation cost, weighted-average recognition period | 2 years 6 months |
Aggregate weighted-average grant-date fair value of units vested | $ 11.8 | $ 14.2
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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