Shareholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Feb. 25, 2021
Class of Stock [Line Items]
Cash dividends received	$ 7,782,000	$ 7,772,000
Repurchase of common stock	56,000	10,000
Market value of shares repurchased under equity compensation plans	$ 55,000	$ 2,000
Employee Stock
Class of Stock [Line Items]
Company's common stock in lieu of cash to exercise options to purchase shares (in shares)	0
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)	0	70
2021 Stock Repurchase Plan
Class of Stock [Line Items]
Repurchase of common stock (in shares)				2,000,000
Stock repurchase program, percentage of common stock				6.70%
2019 Stock Repurchase Plan
Class of Stock [Line Items]
Cumulative number of shares repurchased (in shares)			223
Common Stock
Class of Stock [Line Items]
Repurchase of common stock (in shares)	1,332	293
Repurchase of common stock	$ 24,000	$ 5,000
Market value of shares repurchased under equity compensation plans	$ 55,145	$ 2,500