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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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Aggregate dividends paid during the period for each share of common stock outstanding.

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