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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Gross number of share options (or share units) granted during the period.

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Share-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2023	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares		1,520,000		1,577,000
Stock option awards granted		0
Share-settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of stock option vested		$ 3.4
Unrecognized compensation expense expected to be recognized		2 years 7 months 6 days
Restricted stock units outstanding		116,000		120,000
Share-settled restricted stock units vested		5,780
Number of shares withheld to satisfy tax obligations		1,963
Shares issued		3,817
Granted, weighted average grant date fair value (in dollars per share)		$ 258.65	$ 404.60
Unrecognized share-based compensation expense		$ 34.5
2013 Equity Plan \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vested		139,125
Aggregate fair value of stock option vested		$ 41.4
Weighted average grant date fair value of stock option awards			$ 227.51
Share-based compensation expense recognized		12.9	$ 10.4
Unrecognized share-based compensation expense		$ 116.6
Unrecognized compensation expense expected to be recognized		2 years 6 months
2013 Equity Plan \| Share-settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized		$ 3.4	3.2
Restricted stock units outstanding		115,609
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		$ 0.7	0.1
Unrecognized compensation expense expected to be recognized		10 months 24 days
Unrecognized share-based compensation expense		$ 0.7
2013 Equity Plan \| Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized		2,750,000
Shares of class A common stock reserved and available for future issuance		86,415
2013 Equity Plan \| Class A \| Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares		1,520,079
2023 Equity Plan \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation equity incentive plan expiration period	10 years
2023 Equity Plan \| New Shares of Class A Authorized for Issuance \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized	200,000
2023 Equity Plan \| Maximum Class A Share Rollover from 2013 Plan Authorized for Issuance \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, stock authorized	1,732,703
2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized		$ 0.6	$ 0.6
Unrecognized compensation expense expected to be recognized		4 months 24 days
Unrecognized share-based compensation expense		$ 0.7
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		66,791
Common stock, shares issued		12,672