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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, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | May 03, 2024
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Net proceeds from the sale of Common stock |  |  |  |  | $ 281,784 | $ 15,179 |
Shares withheld as payment for tax withholdings related to share based compensation, market value |  |  |  |  | 2,847 | $ 2,639 |
2021 ATM Program [Member] |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Net proceeds from the sale of Common stock |  |  | $ 281,784 |  |  |  |
Maximum aggregate offering amount of stock | $ 300,000 |  |  |  |  |  |
Cumulative value of Common Stock sold under the 2021 ATM Program |  |  | 298,455 |  |  |  |
Direct costs |  |  | $ 33 |  |  |  |
Number of shares sold and issued under ATM |  |  | 712,000 |  |  |  |
2024 ATM Program [Member] |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Available for sale under ATM Program |  | $ 400,000 |  |  | $ 400,000 |  | $ 400,000
Dividend Reinvestment Plan [Member] |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Stock issued during period, shares, dividend reinvestment plan |  | 13,394 |  |  | 13,398 |  |
Common and Class B Common Stock [Member] |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Cash dividends paid per share of Common and Class B common stock |  | $ 2.7 |  | $ 2.45 | $ 7.85 | $ 7.35 |
Common and Class B Common Stock [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, shares |  | 3,454 |  | 1,033 | 6,159 | 7,080 |
Shares withheld as payment for tax withholdings related to share based compensation, market value |  | $ 1,638 |  | $ 362 | $ 2,787 | $ 2,026 |
Common Stock [Member] | Stock Option [Member] |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, shares |  |  |  | 295 | 3,999 | 17,687 |
Shares withheld as payment for tax withholdings related to share based compensation, market value |  |  |  | $ 106 | $ 1,860 | $ 5,489 |
Cash received from the exercise of stock options |  | 6,097 |  | 5,983 | 22,049 | 18,677 |
Common Stock [Member] | Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Net proceeds from shares purchased under ESPP |  | $ 583 |  | $ 563 | $ 1,734 | $ 1,696 |

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