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Share-based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	May 23, 2023	Dec. 31, 2022
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	1,381,000		1,381,000			1,577,000
Stock options vested			189,125
Aggregate fair value of stock option vested			$ 47,300,000
Weighted average grant date fair value of stock option awards			$ 190.86	$ 209.85
Share-based compensation expense recognized	$ 10,500,000	$ 12,700,000	$ 33,900,000	$ 35,400,000
Unrecognized share-based compensation expense	81,400,000		$ 81,400,000
Unrecognized compensation expense expected to be recognized			2 years 2 months 12 days
Stock option awards granted			36,000
Share-settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of stock option vested			$ 9,000,000.0
Share-based compensation expense recognized	$ 4,900,000	3,600,000	$ 12,200,000	$ 10,000,000.0
Unrecognized compensation expense expected to be recognized			2 years 10 months 24 days
Restricted stock units outstanding	198,993		198,993			120,000
Share-settled restricted stock units vested			18,891
Number of shares withheld to satisfy tax obligations			4,817
Shares issued			14,074
Granted, weighted average grant date fair value (in dollars per share)			$ 280.09	$ 269.14
Unrecognized share-based compensation expense	$ 52,200,000		$ 52,200,000
Share-settled Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of stock option vested	$ 0		$ 0
Unrecognized compensation expense expected to be recognized			2 years 8 months 12 days
Restricted stock units outstanding	25,000		25,000			0
Unrecognized share-based compensation expense	$ 11,000,000		$ 11,000,000
Other Stock Based Awards and Cash Settled RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized		200,000	$ 1,100,000	$ 400,000
Unrecognized compensation expense expected to be recognized			1 year 4 months 24 days
Unrecognized share-based compensation expense	600,000		$ 600,000
2023 Equity Plan \| Share-settled Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of stock option awards			$ 486.18
Share-based compensation expense recognized	$ 1,000,000		$ 1,300,000
Restricted stock units outstanding	25,375		25,375
2023 Equity Plan \| Maximum \| Share-settled Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target performance stock unit awards granted			200.00%
2023 Equity Plan \| Minimum \| Share-settled Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target performance stock unit awards granted			0.00%
2023 Equity Plan \| Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized					1,932,703
Shares of class A common stock reserved and available for future issuance	232,327		232,327
Vesting period			4 years
2023 Equity Plan \| Class A \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	1,380,741		1,380,741
2023 Equity Plan \| Class A \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized					1,732,703
2023 Equity Plan \| New Shares of Class A Authorized for Issuance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized					200,000
2023 Equity Plan \| Board of Director \| Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year
2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized	$ 400,000	$ 500,000	$ 1,400,000	$ 1,600,000
Unrecognized compensation expense expected to be recognized			4 months 24 days
Unrecognized share-based compensation expense	$ 900,000		$ 900,000
2021 Employee Stock Purchase Plan \| Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized	100,000		100,000
Shares of class A common stock reserved and available for future issuance	59,607		59,607
Common stock, shares issued			19,856