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Share-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Apr. 30, 2021 | Dec. 31, 2020
Stock Option Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding, shares | 1,273,000 |  |  | 1,157,000
Stock option awards granted | 280,000 |  |  |
RSU |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense expected to be recognized | 3 years 9 months 18 days |  |  |
Restricted stock units outstanding | 90,000 |  |  | 74,000
Vested | 0 |  |  |
Granted, Weighted Average Grant Date Fair Value (in dollars per share) | $ 691.99 |  |  |
Unrecognized share-based compensation expense | $ 24.2 |  |  |
Granted | 17,000 |  |  |
2013 Equity Plan | Stock Option Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options vested | 78,125 |  |  |
Aggregate fair value of stock option vested | $ 4.5 |  |  |
Weighted average grant date fair value of stock option awards | $ 381.26 |  |  |
Share-based compensation expense recognized | $ 5.3 | $ 3.2 |  |
Unrecognized share-based compensation expense | $ 122.9 |  |  |
Unrecognized compensation expense expected to be recognized | 3 years 8 months 12 days |  |  |
Stock option awards granted | 0 |  |  |
2013 Equity Plan | RSU |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense recognized | $ 1.2 |  |  |
Restricted stock units outstanding | 90,100 |  |  |
2013 Equity Plan | Other Stock-based Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Granted | 9,000 |  |  |
Outstanding | 14,000 |  |  |
2013 Equity Plan | Cash Settled RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Granted | 900 |  |  |
Outstanding | 900 |  |  |
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 | $ 0.9 |  |  |
Unrecognized compensation expense expected to be recognized | 3 years |  |  |
Unrecognized share-based compensation expense | $ 5.4 |  |  |
2013 Equity Plan | Class A | Stock Option Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options outstanding, shares | 1,273,304 |  |  |
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 | 2,300,000 |  |  |
Shares of class A common stock reserved and available for future issuance | 115,138 |  |  |
2013 Equity Plan | Subsequent Event | 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 |
2021 Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense recognized | $ 0.4 |  |  |
Unrecognized compensation expense expected to be recognized | 4 months 24 days |  |  |
Unrecognized share-based compensation expense | $ 1.3 |  |  |
Percentage of discounted share purchase right | 15.00% |  |  |
Shares, Issued | 0 |  |  |
2021 Employee Stock Purchase Plan | Class A |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common Stock Capital Shares Reserved For Future Issuance | 100,000 |  |  |
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. |  |  |

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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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