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Other - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Aug. 04, 2016
May 16, 2016
Feb. 15, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Other [Line Items]              
Cash dividend paid   $ 602,000 $ 594,000     $ 1,198,000 $ 1,033,000
Dividend payable       $ 619,000   $ 619,000  
Dividend payable date       Aug. 15, 2016      
Quarterly dividend declared       $ 0.0425 $ 0.0375 $ 0.0850 $ 0.0750
Dividend Declared | Subsequent Event              
Other [Line Items]              
Dividend payable date Nov. 15, 2016            
Dividend declaration date Aug. 04, 2016            
Quarterly dividend declared $ 0.0425            
Dividend declared, date of record Nov. 01, 2016