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Share-Based Compensation - Summary of Global Employee Stock Purchase Plan Activity (Detail) - Common Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued			28,695,455
HCM Global Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued	182,899	261,895
Purchase price (per share)	$ 54.90	$ 28.70

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Per share or per unit amount of equity securities issued.

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