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Share-Based Compensation - Summary of Global Employee Stock Purchase Plan Activity (Detail) - Common Stock [Member] - $ / shares | 12 Months Ended
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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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