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Earnings Per Share - Summary of Antidilutive Securities Excluded From Computation Of Earnings Per Share (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Equity Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Number of options to purchase Class A shares excluded 4,952,276 6,183,992 4,952,276 6,183,992