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Shareholders' Equity (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Feb. 25, 2021
Class of Stock [Line Items]          
Cash dividends received $ 10,500,000 $ 11,500,000 $ 54,400,000 $ 41,400,000  
Repurchase of common stock $ 67,000 $ 34,000 $ 13,651,000 9,108,000  
Stock options exercised (in shares)     7,500    
Market value of shares repurchased under equity compensation plans     $ 1,168,000 $ 2,134,000  
Equity Compensation Plans          
Class of Stock [Line Items]          
Stock options exercised (in shares)     0    
Employee Stock | Equity Compensation Plans          
Class of Stock [Line Items]          
Company's common stock in lieu of cash to exercise options to purchase shares (in shares)   0   2,506  
Other Share Based Awards | Equity Compensation Plans          
Class of Stock [Line Items]          
Company's common stock in lieu of cash to exercise options to purchase shares (in shares) 1,551 976 32,061 52,437  
Common Stock          
Class of Stock [Line Items]          
Repurchase of common stock (in shares) 1,551 997 376,385 204,964  
Repurchase of common stock $ 33,000 $ 19,000 $ 7,897,000 $ 4,289,000  
Stock options exercised (in shares) 7,500   7,500 8,000  
Common Stock | Equity Compensation Plans          
Class of Stock [Line Items]          
Market value of shares repurchased under equity compensation plans $ 100,000 $ 30,000.00 $ 1,200,000 $ 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) 0 0 344,324 150,000  
Repurchase of common stock $ 0.0 $ 0 $ 12,500,000 $ 7,000,000.0