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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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Aug. 06, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, market value				$ 2,179	$ 0
ATM Program [Member]
Stockholders Equity Note [Line Items]
Number of shares sold under atm				0
Robert W. Baird Co. Inc [Member] \| Sales Agreement [Member] \| ATM Program [Member] \| Maximum [Member]
Stockholders Equity Note [Line Items]
Maximum aggregate offering amount of stock	$ 300,000
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		8,181		8,181
Shares withheld as payment for tax withholdings related to share based compensation, market value		$ 2,179		$ 2,179
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	$ 4.15	$ 3.725
Common Stock \| Stock Option
Stockholders Equity Note [Line Items]
Net proceeds from the sale of Common stock		$ 3,267	$ 4,377	$ 7,222	$ 7,846
Shares withheld as payment for tax withholdings related to share based compensation, shares				2,965
Shares withheld as payment for tax withholdings related to share based compensation, market value				$ 863
Common Stock \| Employee Stock Purchase Plan [Member]
Stockholders Equity Note [Line Items]
Net proceeds from shares purchased under ESPP		$ 541	$ 436	$ 1,006	$ 841