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Stockholders' Equity - Schedule of Share Based Compensation Restricted Stock Units Award Activity (Detail) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Unvested Outstanding Shares, Beginning balance 64.5  
Unvested Shares, Granted 14.9  
Unvested Shares, Vested (5.3)  
Unvested Shares, Forfeited (1.1)  
Unvested Outstanding Shares, Ending balance 73.0  
Unvested Weighted Average Grant Date Fair Value, Beginning balance $ 7.43  
Unvested Weighted Average Grant Date Fair Value, Granted 10.28  
Unvested Weighted Average Grant Date Fair Value, Vested 4.84  
Unvested Weighted Average Grant Date Fair Value, Forfeited 5.68  
Unvested Weighted Average Grant Date Fair Value, Ending balance $ 8.22  
Unvested, Aggregate Intrinsic Value of Unvested RSU $ 744.8 $ 636.0