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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, market value			$ 1,034	$ 983
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	$ 243	$ 555	$ 1,034	$ 983
Shares withheld as payment for tax withholdings related to share based compensation, shares	1,504	3,608	6,332	6,593
Common Stock | Stock Option
Stockholders Equity Note [Line Items]
Net proceeds from the sale of Common stock	$ 3,217	$ 1,526	$ 5,405	$ 2,243
Shares withheld as payment for tax withholdings related to share based compensation, market value	$ 853		$ 853
Shares withheld as payment for tax withholdings related to share based compensation, shares	4,873		4,873
Common Stock | Employee Stock Purchase Plan [Member]
Stockholders Equity Note [Line Items]
Net proceeds from shares purchased under ESPP	$ 475	$ 423	$ 828	$ 833
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	$ 3.375	$ 3.20

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