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Net Income Per Share of Common Stock (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 3,593,000 4,565,000 3,651,000 4,427,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 2,769,000      
Maximum Number Of Potential Dilutive Shares Issued Upon Vesting $ 300 $ 17    
Employee Stock Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 4,000 513,000    
Restricted Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 2,560,543      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 14,000