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Share-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Recognized tax expense (benefit) on exercises | $ 0.1 | $ (22.1) |
Tax benefit on share-based compensation expense | 2.9 | 1.3 |
Total tax benefit related to equity plans | $ 2.8 | $ 23.4 |
Stock Option Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options outstanding, shares | 1,466,000 |  | 1,167,000
Share-settled Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Aggregate fair value of stock option vested | $ 2.7 |  |
Unrecognized compensation expense expected to be recognized | 3 years 2 months 12 days |  |
Restricted stock units outstanding | 108,000 |  | 105,000
Share-settled restricted stock units vested | 3,927 |  |
Number of shares withheld to satisfy tax obligations | 1,473 |  |
Shares issued | 2,454 |  |
Granted, weighted average grant date fair value (in dollars per share) | $ 404.60 | $ 691.99 |
Unrecognized share-based compensation expense | $ 44.1 |  |
2013 Equity Plan | Stock Option Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options vested | 123,625 |  |
Aggregate fair value of stock option vested | $ 28.4 |  |
Weighted average grant date fair value of stock option awards | $ 227.51 | $ 381.26 |
Share-based compensation expense recognized | $ 10.4 | $ 5.3 |
Unrecognized share-based compensation expense | $ 154.2 |  |
Unrecognized compensation expense expected to be recognized | 3 years 3 months 18 days |  |
2013 Equity Plan | Share-settled Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense recognized | $ 3.2 | 1.2 |
Restricted stock units outstanding | 108,273 |  |
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 | $ 0.1 | 0.9 |
Unrecognized compensation expense expected to be recognized | 2 years 9 months 18 days |  |
Unrecognized share-based compensation expense | $ 2.0 |  |
2013 Equity Plan | Class A | Stock Option Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options outstanding, shares | 1,465,779 |  |
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 |  |
Shares of class A common stock reserved and available for future issuance | 241,334 |  |
2021 Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense recognized | $ 0.6 | $ 0.4 |
Unrecognized compensation expense expected to be recognized | 4 months 24 days |  |
Unrecognized share-based compensation expense | $ 0.8 |  |
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 | 87,938 |  |
Common stock, shares issued | 7,450 |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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