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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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