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Shareholders' Equity (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Feb. 25, 2021
Class of Stock [Line Items]        
Cash dividends received $ 71,200 $ 52,800 $ 64,200  
Market value of shares repurchased under equity compensation plans $ 1,363 $ 2,266 $ 2,522  
Stock options        
Class of Stock [Line Items]        
Company's common stock in lieu of cash to exercise options to purchase shares (in shares) 0 2,506 39,447  
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) 36,549 52,437 27,840  
Maximum        
Class of Stock [Line Items]        
Amount available to dividend to holding company $ 184,800      
2021 Stock Repurchase Plan        
Class of Stock [Line Items]        
Repurchase of common stock (in shares)       2,000,000
Stock repurchase plan percentage of common stock       6.70%
Stock repurchase plan, number of shares repurchased (in shares) 379,279 150,000 576,881  
Remaining number of shares available to repurchased (in shares) 830,523      
Common Stock        
Class of Stock [Line Items]        
Stock repurchase plan, number of shares repurchased (in shares) 415,828 209,241 644,168  
Market value of shares repurchased under equity compensation plans $ 1,400 $ 2,100 $ 1,300