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Share-Based Awards - Summary of Restricted Stock Units Activity (Detail) - Unvested restricted stock units
6 Months Ended
Jun. 30, 2021
$ / shares
shares
Restricted Stock Units  
Beginning balance (in shares) | shares 7,316,557
Granted (in shares) | shares 1,155,375
Vested (in shares) | shares (1,592,564)
Forfeited (in shares) | shares (404,654)
Ending balance (in shares) | shares 6,474,714
Weighted- Average Grant- Date Fair Value  
Unvested outstanding, beginning balance (usd per share) | $ / shares $ 48.14
Granted (usd per share) | $ / shares 134.02
Vested (usd per share) | $ / shares 47.76
Forfeited (usd per share) | $ / shares 55.93
Unvested outstanding, ending balance (usd per share) | $ / shares $ 63.08