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Share-Based Compensation - Additional Information (Detail) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 09, 2018 shares | Apr. 24, 2018 shares | Dec. 31, 2020 USD ($) StockOption $ / shares shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Mar. 31, 2020 shares | Apr. 30, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 65,800,000 | $ 36,500,000 | $ 24,700,000 |  |
Performance Shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  |  |  | 4,800,000 |  |
Number of tranches of stock options | StockOption |  |  | 2 |  |  |  |
Share-based compensation expense related to unvested stock option awards not yet recognized | $ |  |  | $ 24,300,000 |  |  |  |
Share-based compensation expense related to unvested awards expected to be recognized over a weighted average period |  |  | 3 years 2 months 12 days |  |  |  |
Term Based Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation expense related to unvested stock option awards not yet recognized | $ |  |  | $ 85,400,000 |  |  |  |
Share-based compensation expense related to unvested awards expected to be recognized over a weighted average period |  |  | 1 year 8 months 12 days |  |  |  |
Stock options, vested |  |  | 3,085,305 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation expense related to unvested awards expected to be recognized over a weighted average period |  |  | 1 year 6 months |  |  |  |
Stock options, vested |  |  | 226,616 |  |  |  |
Shares issued upon vesting of RSUs |  |  | 73,475 |  |  |  |
Vested and releasable |  |  | 423,479 |  |  |  |
Share-based compensation expense related to unvested restricted stock units not yet recognized | $ |  |  | $ 44,200,000 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-based Compensation Award, Tranche Three [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock vesting period |  |  | 4 years |  |  |  |
Minimum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock vesting period |  |  | 1 year |  |  |  |
Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock vesting period |  |  | 3 years |  |  |  |
HCM Stock Incentive Plan 2007 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares outstanding |  |  | 2,500 |  |  |  |
HCM Stock Incentive Plan 2013 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares outstanding |  |  | 2,219,243 |  |  |  |
Share based compensation arrangement by share based payment award exercise period after employment termination |  |  | 90 days |  |  |  |
Stock option awards, contractual term |  |  | 10 years |  |  |  |
HCM Stock Incentive Plan 2013 [Member] | Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares outstanding |  |  | 0 | 0 |  |  |
Number of shares authorized |  |  |  |  |  |  | 600,000
Share-based compensation expense | $ |  |  |  |  | $ 1,500,000 |  |
HCM Stock Incentive Plan 2013 [Member] | Term Based Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expected term of stock options granted |  |  | 7 years |  |  |  |
HCM Stock Incentive Plan 2013 [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock vesting period |  |  | 4 years |  |  |  |
HCM Stock Incentive Plan 2013 [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock vesting period |  |  | 5 years |  |  |  |
HCM Equity Incentive Plan 2018 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares outstanding |  |  | 12,130,215 |  |  |  |
Share based compensation arrangement by share based payment award exercise period after employment termination |  | 90 days |  |  |  |  |
Stock option awards, contractual term |  | 10 years |  |  |  |  |
Number of shares authorized |  | 13,500,000 |  |  |  |  |
Shares reserved for issuance increase percentage |  | 3.00% |  |  |  |  |
Common stock, share Reserve |  |  |  |  |  | 4,199,089 |
Shares available for future grants of equity awards |  |  | 9,765,067 |  |  |  |
HCM Equity Incentive Plan 2018 [Member] | Share-based Compensation Award, Tranche Three [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock vesting period |  | 4 years |  |  |  |  |
HCM Equity Incentive Plan 2018 [Member] | Performance Shares [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock vesting period |  |  | 3 years |  |  |  |
Options, Granted |  |  | 1,500,000 |  |  |  |
Exercise price per share | $ / shares |  |  | $ 65.26 |  |  |  |
Vesting conditions description |  |  | The vesting conditions for the Performance Option Award are based on the Company’s performance on the New York Stock Exchange (“NYSE”) with 750,000 shares available to vest when the Company’s per share closing price on the NYSE meets or exceeds $110.94, or 1.7 times the exercise price, for ten consecutive trading days, and the remaining 750,000 shares are available to vest when the Company’s per share closing price on the NYSE meets or exceeds $130.52, or 2.0 times the exercise price, for ten consecutive trading days. |  |  |  |
HCM Equity Incentive Plan 2018 [Member] | Performance Shares [Member] | Monte-Carlo Simulation Model [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock vesting period |  |  | 5 years 3 months 18 days |  |  |  |
HCM Equity Incentive Plan 2018 [Member] | Performance Shares [Member] | Closing Price Per Share Exceeds $110.94 or 1.7 Times the Exercise Price [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available to vest |  |  | 750,000 |  |  |  |
Closing price per share on NYSE to available for vest | $ / shares |  |  | $ 110.94 |  |  |  |
HCM Equity Incentive Plan 2018 [Member] | Performance Shares [Member] | Closing Price Per Share Exceeds $130.52 or 2.0 Times the Exercise Price [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available to vest |  |  | 750,000 |  |  |  |
Closing price per share on NYSE to available for vest | $ / shares |  |  | $ 130.52 |  |  |  |
HCM Equity Incentive Plan 2018 [Member] | Term Based Stock Options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expected term of stock options granted |  |  | 7 years |  |  |  |
HCM Equity Incentive Plan 2018 [Member] | Performance Stock Units ("PSUs") [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
RSUs, Granted |  |  | 145,017 |  |  |  |
PSUs, forfeited and cancelled |  |  | 9,797 |  |  |  |
HCM Equity Incentive Plan 2018 [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock vesting period |  | 1 year |  |  |  |  |
HCM Equity Incentive Plan 2018 [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock vesting period |  | 3 years |  |  |  |  |
2020 Management Incentive Plan [Member] | Performance Stock Units ("PSUs") [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation expense | $ |  |  | $ 0 |  |  |  |
Stock options, vested |  |  | 0 |  |  |  |
HCM Global Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock option awards, contractual term | 10 years |  |  |  |  |  |
Expected term of stock options granted |  |  | 3 months 18 days | 4 months 24 days |  |  |
Description for purchase price of fair market value of common stock |  |  | The purchase price is the lower of (i) 85% of the fair market value of a share of common stock on the offering date (the first trading day of the offering period commencing on January 1 and concluding on December 31) or (ii) 85% of the fair market value of a share of common stock on the purchase date. |  |  |  |
Percentage of fair market value of a share of common stock on offering date | 85.00% |  |  |  |  |  |
Percentage of fair market value of share of common stock on purchase date | 85.00% |  |  |  |  |  |
HCM Global Employee Stock Purchase Plan [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized | 2,500,000 |  |  |  |  |  |

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