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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