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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, market value			$ 1,528	$ 3,782
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	$ 535	$ 1,562	$ 1,518	$ 3,775
Shares withheld as payment for tax withholdings related to share based compensation, shares	3,231	8,830	9,824	21,754
Common Stock | Stock Option
Stockholders Equity Note [Line Items]
Net proceeds from the sale of Common stock	$ 3,986	$ 856	$ 6,229	$ 4,837
Shares withheld as payment for tax withholdings related to share based compensation, market value	$ 134	$ 69	$ 134	$ 1,269
Shares withheld as payment for tax withholdings related to share based compensation, shares	799	376	799	7,027
Common Stock | Employee Stock Purchase Plan [Member]
Stockholders Equity Note [Line Items]
Net proceeds from shares purchased under ESPP	$ 418	$ 382	$ 1,251	$ 1,142
Common Stock | Class B Common Stock
Stockholders Equity Note [Line Items]
Cash dividends paid per share of Common and Class B common stock	$ 1.60	$ 1.45	$ 4.80	$ 4.15

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

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