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Share-based Compensation - Summary of RSU 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 (target) $ 0 $ 15.86    
Restricted Stock Units (RSUs) [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Non-vested units at January 1, 2021     124  
Granted (target)     45  
Achieved performance adjustment [1]     2  
Vested     (42)  
Non-vested units at June 30, 2021 129   129  
Weighted Average Grant Date Fair Value, Non-vested units at January 1, 2020     $ 21.89  
Weighted Average Grant Date Fair Value, Granted (target)     30.22 $ 15.86
Weighted Average Grant Date Fair Value, Achieved performance adjustment [1]     28.25  
Weighted Average Grant Date Fair Value, Vested     28.25  
Weighted Average Grant Date Fair Value Non-vested units at September 30, 2020 $ 22.84   $ 22.84  
[1] The 2018 LTIP RSUs were earned and vested at 105.6% of target, as described in greater detail in the Company’s definitive proxy statement filed with the SEC on April 16, 2021.