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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 06, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Stockholders Equity Note [Line Items] |  |  |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, market value |  |  |  | $ 2,471 | $ 894
ATM Program [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Maximum aggregate offering amount of stock | $ 300,000 |  |  |  |
Number of shares sold under atm |  |  |  | 0 |
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, shares |  | 879 | 3,250 | 9,060 | 3,250
Shares withheld as payment for tax withholdings related to share based compensation, market value |  | $ 252 | $ 894 | $ 2,431 | $ 894
Common and Class B Common Stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Cash dividends paid per share of Common and Class B common stock |  | $ 2.2 | $ 1.95 | $ 6.35 | $ 5.675
Common Stock | Stock Option |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Net proceeds from the sale of Common stock |  | $ 7,929 | $ 2,094 | $ 15,151 | $ 9,940
Shares withheld as payment for tax withholdings related to share based compensation, shares |  | 1,053 |  | 1,053 | 2,965
Shares withheld as payment for tax withholdings related to share based compensation, market value |  | $ 298 |  | $ 298 | $ 863
Common Stock | Employee Stock Purchase Plan [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Net proceeds from shares purchased under ESPP |  | $ 478 | $ 392 | $ 1,484 | $ 1,233

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