Stock-Based Compensation - Information about Deferred Tax Benefits Recognized Related to Restricted Stock Awards, Paid Dividends and the Fair Value of Vested Restricted Stock (Detail) - Restricted Stock [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred tax benefits recognized (derecognized)	$ 639	$ 495	$ 1,291	$ 459
Tax benefits realized for restricted stock and paid dividends	902	1,357	1,304	1,412
Fair value of vested restricted stock	$ 2,303	$ 3,002	$ 4,871	$ 4,742