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Share-based Compensation - Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs) [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested, January 1, 2018 201    
Granted 59    
Vested 0    
Forfeited (78)    
Non-vested, at December 31, 2018 182 201  
Weighted Average Grant Date Fair Value, Non-vested, January 1, 2018 $ 17.33    
Weighted Average Grant Date Fair Value, Granted 28.25 $ 19.99 $ 17.02
Weighted Average Grant Date Fair Value, Vested 0    
Weighted Average Grant Date Fair Value, Forfeited 14.92    
Weighted Average Grant Date Fair Value, Non-vested, at December 31, 2018 $ 21.89 $ 17.33