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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 06, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Stockholders Equity Note [Line Items] |  |  |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, market value |  |  |  | $ 2,179 | $ 0
ATM Program [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Number of shares sold under atm |  |  |  | 0 |
Robert W. Baird Co. Inc [Member] | Sales Agreement [Member] | ATM Program [Member] | Maximum [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Maximum aggregate offering amount of stock | $ 300,000 |  |  |  |
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 |  | 8,181 |  | 8,181 |
Shares withheld as payment for tax withholdings related to share based compensation, market value |  | $ 2,179 |  | $ 2,179 |
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 | $ 4.15 | $ 3.725
Common Stock | Stock Option |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Net proceeds from the sale of Common stock |  | $ 3,267 | $ 4,377 | $ 7,222 | $ 7,846
Shares withheld as payment for tax withholdings related to share based compensation, shares |  |  |  | 2,965 |
Shares withheld as payment for tax withholdings related to share based compensation, market value |  |  |  | $ 863 |
Common Stock | Employee Stock Purchase Plan [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Net proceeds from shares purchased under ESPP |  | $ 541 | $ 436 | $ 1,006 | $ 841

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