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Stockholders' Equity - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Oct. 04, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jul. 25, 2017
Business Acquisition, Equity Interests Issued or Issuable [Line Items]            
Cash dividend on common stock per share   $ 0.070 $ 0.055 $ 0.210 $ 0.165  
Subsequent Event [Member] | Installment 2 FY 2018 [Member]            
Business Acquisition, Equity Interests Issued or Issuable [Line Items]            
Cash dividend on common stock per share $ 0.07          
Dividend payment date Dec. 06, 2018          
Dividend Payment $ 1,400,000          
Dividend record date Nov. 20, 2018          
Stock Repurchase Program [Member]            
Business Acquisition, Equity Interests Issued or Issuable [Line Items]            
Stock repurchase program expiration date       Jul. 25, 2018    
Stock repurchase program, Description       This program expired on July 25, 2018.    
Share repurchases       0    
Stock Repurchase Program [Member] | Maximum [Member] | Common Stock [Member]            
Business Acquisition, Equity Interests Issued or Issuable [Line Items]            
Repurchase of common stock           $ 7,500,000