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Shareholders' Equity (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Feb. 25, 2021
Class of Stock [Line Items]          
Cash dividends received $ 72,400,000 $ 10,500,000 $ 112,900,000 $ 54,400,000  
Market value of shares repurchased under equity compensation plans     $ 1,072,000 $ 1,168,000  
Equity Compensation Plans          
Class of Stock [Line Items]          
Stock options exercised (in shares) 0 0 0 0  
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) 3,899 1,551 25,563 32,061  
Common Stock          
Class of Stock [Line Items]          
Stock options exercised (in shares)   7,500   7,500  
Common Stock | Equity Compensation Plans          
Class of Stock [Line Items]          
Market value of shares repurchased under equity compensation plans $ 200,000 $ 100,000 $ 1,100,000 $ 1,200,000  
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) 52,106 0 521,738 344,324  
Repurchase of common stock $ 2,300,000 $ 0 $ 21,300,000 $ 12,500,000  
Remaining authorized shares (in shares) 310,000   310,000