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Stock-Based Compensation - Reconciliation of Outstanding Balance of Stock Options (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Options, Outstanding at beginning 558  
Options, Granted 0 0
Options, Exercised (8)  
Options, Forfeited or expired 0  
Options, Outstanding at ending 550  
Options, Exercisable at ending 383  
Options, Unvested at ending 167  
Weighted Average Exercise Price, Outstanding at beginning $ 31.22  
Weighted Average Exercise Price, Granted 0  
Weighted Average Exercise Price, Exercised 18.01  
Weighted Average Exercise Price, Forfeited or expired 0  
Weighted Average Exercise Price, Outstanding at ending 31.40  
Weighted Average Exercise Price, Exercisable at ending 29.95  
Weighted Average Exercise Price, Unvested at ending 34.73  
Weighted Average Grant Date Fair Value, Outstanding at beginning 14.03  
Weighted Average Grant Date Fair Value, Granted 0  
Weighted Average Grant Date Fair Value, Exercised 8.85  
Weighted Average Grant Date Fair Value, Forfeited or expired 0  
Weighted Average Grant Date Fair Value, Outstanding at ending $ 14.10  
Aggregate Intrinsic Value, Outstanding $ 0  
Aggregate Intrinsic Value, Exercisable 0  
Aggregate Intrinsic Value, Unvested $ 0