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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, market value				$ 894	$ 2,299
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
Common and 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		3,250	5,361	3,250	11,693
Shares withheld as payment for tax withholdings related to share based compensation, market value		$ 894	$ 1,265	$ 894	$ 2,299
Common and Class B Common Stock | Non-Vested Restricted Stock | Robert W. Baird Co. Inc [Member]
Stockholders Equity Note [Line Items]
Sale of stock number of shares issued in transaction				0
Common Stock | Stock Option
Stockholders Equity Note [Line Items]
Net proceeds from the sale of Common stock		$ 2,094	$ 6,573	$ 9,940	$ 11,978
Shares withheld as payment for tax withholdings related to share based compensation, shares		2,965	6,582	2,965	11,455
Shares withheld as payment for tax withholdings related to share based compensation, market value		$ 863	$ 1,490	$ 863	$ 2,343
Common Stock | Employee Stock Purchase Plan [Member]
Stockholders Equity Note [Line Items]
Net proceeds from shares purchased under ESPP		$ 392	$ 401	$ 1,233	$ 1,229
Common Stock | Class B Common Stock
Stockholders Equity Note [Line Items]
Cash dividends paid per share of Common and Class B common stock		$ 1.95	$ 1.775	$ 5.675	$ 5.15

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