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Shareholders' Equity (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Feb. 25, 2021
Class of Stock [Line Items] |  |  |  |  |
Cash dividends received | $ 23,400,000 | $ 11,600,000 | $ 43,900,000 | $ 29,800,000 |
Repurchase of common stock | $ 10,177,000 | $ 1,479,000 | 13,585,000 | 9,074,000 |
Market value of shares repurchased under equity compensation plans |  |  | $ 1,102,000 | $ 2,100,000 |
Employee Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Company's common stock in lieu of cash to exercise options to purchase shares (in shares) |  | 2,506 |  | 2,506 |
Other Share Based Awards |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Company's common stock in lieu of cash to exercise options to purchase shares (in shares) | 30,510 | 39,080 | 30,510 | 51,461 |
Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Repurchase of common stock (in shares) | 275,502 | 41,586 | 374,834 | 203,967 |
Repurchase of common stock | $ 5,781,000 | $ 871,000 | $ 7,865,000 | $ 4,270,000 |
Market value of shares repurchased under equity compensation plans | $ 1,100,000 | $ 1,500,000 | $ 1,100,000 | $ 2,100,000 |
2021 Stock Repurchase Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  | 2,000,000.0
Stock repurchase program, percentage of common stock |  |  |  |  | 6.70%
Repurchase of common stock (in shares) | 244,992 | 0 | 344,324 | 150,000 |
Repurchase of common stock | $ 9,100,000 | $ 0 | $ 12,500,000 | $ 7,000,000.0 |

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