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Stock-Based Compensation - Activity (Detail) - $ / shares
3 Months Ended 6 Months Ended
Jun. 17, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued under equity compensation plans (in shares)   0 95,000 49,000 115,000
Performance Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, additional shares authorized (in shares) 10,000,000        
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock, additional shares authorized (in shares) 1,000,000        
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted stock options (in shares)   0 17.00 11.88 18.51
Weighted average grant-date fair value, options (in dollars per share)   $ 275,000 $ 263,000 $ 520,000 $ 396,000
Restricted Stock Units (RSU)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards granted (in shares)   21.65 31.76 20.36 34.85
Weighted average grant-date fair value, RSUs (in dollars per share)   $ 947,000 $ 738,000 $ 2,305,000 $ 1,436,000