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Stock-Based Compensation - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized number of common stock shares for grant 1,200,000    
Date of plan approval May 16, 2018    
Maximum grant period from date of plan approval 10 years    
Shares granted under the plan 0    
Compensation cost related to restricted stock $ 1,600,000 $ 1,300,000  
Compensation cost related to stock options $ 300,000 100,000  
Stock options granted 61,514    
Cash received from stock option exercises under the plan $ 0 100,000  
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized number of common stock shares for grant     1,000,000
Number of shares purchased 7,382    
Compensation cost $ 100,000    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to non-vested stock options $ 5,500,000    
Unrecognized compensation cost related to nonvested stock options, weighted-average period 2 years 7 months 6 days    
Tax benefit generated from compensation cost and credited $ 100,000 300,000  
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to non-vested stock options $ 1,700,000    
Unrecognized compensation cost related to nonvested stock options, weighted-average period 3 years 1 month 6 days    
Tax benefit generated from compensation cost and credited $ 0 600,000  
Capitalized compensation cost $ 0 $ 0  
Stock options granted 61,514 58,204  
Stock options exercised 0 32,000