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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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