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Shareholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Feb. 25, 2021
Class of Stock [Line Items]          
Cash dividends received $ 28,500 $ 23,400 $ 40,600 $ 43,900  
Market value of shares repurchased under equity compensation plans     $ 907 $ 1,102  
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) 11,542 30,510 21,664 30,510  
Common Stock | Equity Compensation Plans          
Class of Stock [Line Items]          
Market value of shares repurchased under equity compensation plans $ 500 $ 1,100 $ 900 $ 1,100  
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) 379,978 244,992 469,632 344,324  
Repurchase of common stock $ 15,200 $ 9,100 $ 18,900 $ 12,500  
Remaining authorized shares (in shares) 360,000   360,000