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Other - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Mar. 12, 2019
Feb. 15, 2019
Mar. 31, 2019
Mar. 31, 2018
Other [Line Items]        
Quarterly dividend declared     $ 0.0425 $ 0.0425
Cash dividend paid     $ 906 $ 652
Dividend Declared [Member]        
Other [Line Items]        
Quarterly dividend declared $ 0.0425      
Dividend payable     $ 900  
Dividend declared, date of record     May 01, 2019  
Dividend declaration date Mar. 12, 2019      
Dividend payable date May 15, 2019      
Dividend Paid [Member]        
Other [Line Items]        
Cash dividend paid   $ 900    
Dividend declared, date of record   Feb. 01, 2019