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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, market value			$ 0	$ 1,034
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		1,504		6,332
Shares withheld as payment for tax withholdings related to share based compensation, market value		$ 243		$ 1,034
Common Stock | Stock Option
Stockholders Equity Note [Line Items]
Net proceeds from the sale of Common stock	$ 4,377	$ 3,217	$ 7,846	$ 5,405
Shares withheld as payment for tax withholdings related to share based compensation, shares	2,965	4,873	2,965	4,873
Shares withheld as payment for tax withholdings related to share based compensation, market value	$ 863	$ 853	$ 863	$ 853
Common Stock | Employee Stock Purchase Plan [Member]
Stockholders Equity Note [Line Items]
Net proceeds from shares purchased under ESPP	$ 436	$ 475	$ 841	$ 828
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	$ 3.725	$ 3.375

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

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