Shareholders' Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Feb. 25, 2021
Class of Stock [Line Items]
Cash dividends received	$ 64,188,000	$ 31,571,000	$ 63,419,000
Stock repurchase plan, amount of shares repurchased	27,148,000	4,958,000	27,069,000
Market value of shares repurchased under equity compensation plans	$ 2,522,000	$ 2,118,000	$ 736,000
Stock options
Class of Stock [Line Items]
Company's common stock in lieu of cash to exercise options to purchase shares (in shares)	39,447	28,276	12,488
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)	27,840	19,413	12,058
Maximum
Class of Stock [Line Items]
Amount available to dividend to holding company	$ 157,036,000
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%
Cumulative number of shares repurchased (in shares)	576,881	63,317
2019 Stock Repurchase Plan
Class of Stock [Line Items]
Cumulative number of shares repurchased (in shares)		223	858,717
Common Stock
Class of Stock [Line Items]
Stock repurchase plan, number of shares repurchased (in shares)	644,168	111,229	883,263
Stock repurchase plan, amount of shares repurchased	$ 13,440,000	$ 1,987,000	$ 15,746,000
Market value of shares repurchased under equity compensation plans	$ 1,269,000	$ 2,118,000	$ 736,000