Aggregate dividends paid during the period for each share of common stock outstanding.

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Maximum aggregate offering amount of stock.

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Number of shares sold under atm.

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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Aug. 06, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, market value				$ 2,471	$ 894
ATM Program [Member]
Stockholders Equity Note [Line Items]
Maximum aggregate offering amount of stock	$ 300,000
Number of shares sold under atm				0
Class B Common Stock \| Non-Vested Restricted Stock
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, shares		879	3,250	9,060	3,250
Shares withheld as payment for tax withholdings related to share based compensation, market value		$ 252	$ 894	$ 2,431	$ 894
Common and Class B Common Stock
Stockholders Equity Note [Line Items]
Cash dividends paid per share of Common and Class B common stock		$ 2.2	$ 1.95	$ 6.35	$ 5.675
Common Stock \| Stock Option
Stockholders Equity Note [Line Items]
Net proceeds from the sale of Common stock		$ 7,929	$ 2,094	$ 15,151	$ 9,940
Shares withheld as payment for tax withholdings related to share based compensation, shares		1,053		1,053	2,965
Shares withheld as payment for tax withholdings related to share based compensation, market value		$ 298		$ 298	$ 863
Common Stock \| Employee Stock Purchase Plan [Member]
Stockholders Equity Note [Line Items]
Net proceeds from shares purchased under ESPP		$ 478	$ 392	$ 1,484	$ 1,233