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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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