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Share-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2021	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized tax benefits on exercises		$ 37.7	$ 3.2
Share-based compensation expense recognized		8.2	2.0
Total tax related to equity plan		$ 45.9	$ 5.2
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield		0.00%	0.00%	0.00%
Options outstanding, shares	1,157,000	1,167,000	1,157,000	1,634,000		1,480,000
Share-settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of stock option vested		$ 3.3
Unrecognized compensation expense expected to be recognized		3 years 4 months 24 days
Restricted stock units outstanding	74,000	105,000	74,000	0
Share-settled restricted stock units vested		17,004	0
Number of shares withheld to satisfy tax obligations		5,857
Shares issued		11,147
Granted, Weighted Average Grant Date Fair Value (in dollars per share)		$ 736.46	$ 192.43
Granted		58,000	76,000
Unrecognized share-based compensation expense		$ 44.6
2013 Equity Plan \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vested		200,625	200,000	216,250
Aggregate fair value of stock option vested		$ 11.0	$ 11.2	$ 12.6
Weighted average grant date fair value of stock option awards		$ 372.05	$ 49.68	$ 54.36
Share-based compensation expense recognized		$ 32.0	$ 10.1	$ 10.1
Unrecognized share-based compensation expense		$ 96.1
Unrecognized compensation expense expected to be recognized		3 years
2013 Equity Plan \| Share-settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		4 years
Share-based compensation expense recognized		$ 8.0	$ 0.5
Restricted stock units outstanding		105,115
Granted	0
2013 Equity Plan \| Other Stock-based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		9,000	0	0
Outstanding		10,250
2013 Equity Plan \| Other Stock Based Awards and Cash Settled RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized		$ 1.4	$ 0.6
Unrecognized compensation expense expected to be recognized		2 years 10 months 24 days
Unrecognized share-based compensation expense		$ 2.5
2013 Equity Plan \| Cash Settled RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted		900
Outstanding		900
2013 Equity Plan \| Class A \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares		1,166,754
2013 Equity Plan \| Class A \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award expiration period		10 years
Vesting period		4 years
2013 Equity Plan \| Class A \| Employees, Officers, and Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized		2,750,000			2,300,000
Shares of class A common stock reserved and available for future issuance		549,269
2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized		$ 2.6
Unrecognized compensation expense expected to be recognized		2 months 12 days
Unrecognized share-based compensation expense		$ 0.5
Percentage of discounted share purchase right		15.00%
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
Shares of class A common stock reserved and available for future issuance		95,388
Share Purchase Price Description		shares are purchased at a price equal to 85% of the lesser of the closing price of the Company’s class A common stock on the first or last business day of the offering period, respectively
Purchase price of common stock, percentage of fair market value		85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used		the intrinsic value of the 15% discounted share purchase rights and the fair value of the look-back provision using the Black-Scholes valuation model, recognized on a straight-line basis over the offering period. The grant date is the offering period commencement date.
Common stock, shares issued under ESPP		4,612