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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 25, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Stockholders Equity Note [Line Items] |  |  |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, market value |  |  |  | $ 2,639 | $ 2,471
ATM Program [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Maximum aggregate offering amount of stock | $ 300,000 |  |  |  |
Number of shares sold under ATM |  |  |  | 45,000 |
Net proceeds from the sale of Common stock |  |  |  | $ 15,179 |
Direct costs |  |  |  | 375 |
Available for sale under ATM Program |  | $ 284,745 |  | $ 284,745 |
Common stock, issued |  | 45,000 |  | 45,000 |
Class B Common Stock | Restricted Stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, shares |  |  | 879 |  | 9,060
Shares withheld as payment for tax withholdings related to share based compensation, market value |  |  | $ 252 |  | $ 2,431
Common and Class B Common Stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Cash dividends paid per share of Common and Class B common stock |  | $ 2.45 | $ 2.2 | $ 7.35 | $ 6.35
Common and Class B Common Stock | Restricted Stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, shares |  | 1,033 |  | 7,080 |
Shares withheld as payment for tax withholdings related to share based compensation, market value |  | $ 362 |  | $ 2,026 |
Common Stock | Employee Stock Option [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Net proceeds from the sale of Common stock |  | $ 5,983 | $ 7,929 | $ 18,677 | $ 15,151
Shares withheld as payment for tax withholdings related to share based compensation, shares |  | 295 | 1,053 | 17,687 | 1,053
Shares withheld as payment for tax withholdings related to share based compensation, market value |  | $ 106 | $ 298 | $ 5,489 | $ 298
Common Stock | Employee Stock Purchase Plan [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Net proceeds from shares purchased under ESPP |  | $ 563 | $ 478 | $ 1,696 | $ 1,484

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