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Shareholders' Equity - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Feb. 25, 2021
Class of Stock [Line Items]        
Cash dividends received $ 52,800 $ 64,200 $ 31,600  
Market value of shares repurchased under equity compensation plans $ 2,266 $ 2,522 $ 2,118  
Stock options        
Class of Stock [Line Items]        
Company's common stock in lieu of cash to exercise options to purchase shares (in shares) 2,506 39,447 28,276  
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) 56,714 27,840 19,413  
Maximum        
Class of Stock [Line Items]        
Amount available to dividend to holding company $ 223,400      
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) 150,000 576,881 63,317  
Remaining number of shares available to repurchased (in shares) 1,209,802      
Common Stock        
Class of Stock [Line Items]        
Stock repurchase plan, number of shares repurchased (in shares) 209,241 644,168 111,229  
Market value of shares repurchased under equity compensation plans $ 2,300 $ 1,300 $ 2,100