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Share-based Compensation - Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs) [Member] - $ / shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-vested units at January 1, 2019     182  
Granted (target)     39  
Achieved performance adjustment     8  
Vested     (54)  
Forfeited     0  
Non-vested units at June 30, 2019 175   175  
Weighted Average Grant Date Fair Value, Non-vested units at January 1, 2019     $ 21.89  
Weighted Average Grant Date Fair Value, Granted (target) 27.89 $ 28.25
Weighted Average Grant Date Fair Value, Achieved performance adjustment     16.98  
Weighted Average Grant Date Fair Value, Vested     16.98  
Weighted Average Grant Date Fair Value, Forfeited     0  
Weighted Average Grant Date Fair Value Non-vested units at June 30, 2019 $ 24.55   $ 24.55