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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, market value			$ 2,299	$ 1,528
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, market value	$ 1,265	$ 535	$ 2,299	$ 1,518
Shares withheld as payment for tax withholdings related to share based compensation, shares	5,361	3,231	11,693	9,824
Common Stock | Stock Option
Stockholders Equity Note [Line Items]
Net proceeds from the sale of Common stock	$ 6,573	$ 3,986	$ 11,978	$ 6,229
Shares withheld as payment for tax withholdings related to share based compensation, market value	$ 1,490	$ 134	$ 2,343	$ 134
Shares withheld as payment for tax withholdings related to share based compensation, shares	6,582	799	11,455	799
Common Stock | Employee Stock Purchase Plan [Member]
Stockholders Equity Note [Line Items]
Net proceeds from shares purchased under ESPP	$ 401	$ 418	$ 1,229	$ 1,251
Common Stock | Class B Common Stock
Stockholders Equity Note [Line Items]
Cash dividends paid per share of Common and Class B common stock	$ 1.775	$ 1.60	$ 5.15	$ 4.80

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

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