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Other - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Aug. 06, 2019
May 15, 2019
Feb. 15, 2019
Jun. 30, 2019
Jun. 30, 2018
Other [Line Items]          
Quarterly dividend declared       $ 0.085 $ 0.085
Cash dividend paid       $ 1,786 $ 1,535
Dividend Declared [Member]          
Other [Line Items]          
Dividend payable       $ 900  
Dividend payable date       Aug. 15, 2019  
Dividend Declared [Member] | Subsequent Event [Member]          
Other [Line Items]          
Quarterly dividend declared $ 0.0425        
Dividend declared, date of record Nov. 01, 2019        
Dividend declaration date Aug. 06, 2019        
Dividend payable date Nov. 15, 2019        
Dividend Paid [Member]          
Other [Line Items]          
Cash dividend paid   $ 900 $ 900    
Dividend payable       $ 900  
Dividend declared, date of record   May 01, 2019 Feb. 01, 2019