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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, market value			$ 983	$ 2,213
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	$ 555	$ 2,213	$ 983	$ 2,213
Shares withheld as payment for tax withholdings related to share based compensation, shares	3,608	12,924	6,593	12,924
Common Stock | Stock Option
Stockholders Equity Note [Line Items]
Net proceeds from the sale of Common stock	$ 1,526	$ 1,369	$ 2,243	$ 3,981
Shares withheld as payment for tax withholdings related to share based compensation, market value		$ 286		$ 1,200
Shares withheld as payment for tax withholdings related to share based compensation, shares		1,610		6,651
Common Stock | Employee Stock Purchase Plan [Member]
Stockholders Equity Note [Line Items]
Net proceeds from shares purchased under ESPP	$ 423	$ 414	$ 833	$ 760
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	$ 3.20	$ 2.70

X

- Definition

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

+ References

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Stockholders Equity Note [Line Items]

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