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Share-based Compensation - Summary of RSA Activity (Detail) - $ / shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Weighted Average Grant Date Fair Value, Granted $ 0 $ 15.86    
Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Non-vested units at January 1, 2021     266  
Granted     153  
Vested     (65)  
Forfeited     (2)  
Non-vested units at June 30, 2021 352   352  
Weighted Average Grant Date Fair Value, Non-vested units at January 1, 2020     $ 19.34  
Weighted Average Grant Date Fair Value, Granted $ 46.55 $ 15.58 30.33 $ 19.39
Weighted Average Grant Date Fair Value, Vested     16.31  
Weighted Average Grant Date Fair Value, Forfeited     22.82  
Weighted Average Grant Date Fair Value Non-vested units at September 30, 2020 $ 24.66   $ 24.66