v3.20.4
Stock-Based Compensation - Summary of RSUs/Restricted Stock Granted in Connection with Annual Incentive Compensation under Award Plan (Detail) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted Stock and RSUs, Granted 969,095    
RSUs/Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted Stock and RSUs, Granted 504,403 674,206 527,337
Awards to employees cliff vesting 393,161 377,291 209,201
Annual RSUs Granted [Member] | RSUs/Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted Stock and RSUs, Granted 897,564 1,051,497 736,538