Stock Repurchase Plans - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended												12 Months Ended
	Dec. 31, 2021	Nov. 30, 2021	Oct. 31, 2021	Sep. 30, 2021	Aug. 31, 2021	Jul. 31, 2021	Jun. 30, 2021	May 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Feb. 28, 2021	Jan. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	May 23, 2019
Equity Class Of Treasury Stock [Line Items]
Purchase of treasury shares (in shares)	62,044	1,700	409	212	53	703	1,117	1,144	968	0	2,630	63,349	134,329
Purchase of treasury shares															$ 24,998
Class A Common Stock [Member]
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount																$ 100,000
Purchase of treasury shares (in shares)													0	0	626,320
Purchase of treasury shares															$ 25,000
Class A Common Stock [Member] \| Employee Restricted Stock Plan [Member]
Equity Class Of Treasury Stock [Line Items]
Purchase of treasury shares													$ 9,100	$ 8,000	$ 4,000
Stock tendered for payments of withholding taxes (in shares)													134,329	148,242	98,260