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Other - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Aug. 04, 2015
May. 15, 2015
Feb. 13, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Other [Line Items]              
Cash dividend paid   $ 520,000 $ 514,000     $ 1,033,000 $ 1,007,000
Dividend payable       $ 528,000   $ 528,000  
Dividend payable date       Aug. 15, 2015      
Quarterly dividend declared       $ 0.0375 $ 0.0375 $ 0.0750 $ 0.0750
Subsequent Event | Dividend Declared              
Other [Line Items]              
Dividend payable date Nov. 13, 2015            
Dividend declaration date Aug. 04, 2015            
Quarterly dividend declared $ 0.0425            
Dividend declared, date of record Oct. 30, 2015