v3.25.1
Share-Based Compensation - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares available for future grants of equity awards 6.6  
Share-based compensation expense $ 45.9 $ 38.0
Share-based compensation expense related to unvested stock option awards not yet recognized $ 310.7  
Share-based compensation expense related to unvested awards expected to be recognized over a weighted average period 2 years 2 months 12 days  
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]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Common shares outstanding 12.6  
HCM Global Employee Stock Purchase Plan [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares available for future grants of equity awards 1.1