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Share based compensation arrangement by share based payment award exercise period after employment termination.

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Share based compensation arrangement by share based payment award increase percentage of common stock outstanding.

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Contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Share based compensation arrangement by share based payment award to be vested.

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Share based compensation by share based payment award percentage of fair market value of share of common stock on purchase date.

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Share based compensation by share based payment award percentage of fair market value of a share of common stock on offering date.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition.

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Description of terms of share-based payment arrangement. Includes, but is not limited to, type of award or grantee and reason for issuance.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made 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).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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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.

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Number of options vested.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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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