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Other - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 0 Months Ended
May 15, 2014
Feb. 15, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Apr. 30, 2013
Maximum
Jul. 29, 2014
Subsequent Event
Other [Line Items]                
Cash dividend paid $ 506,000 $ 501,000     $ 1,007,000 $ 720,000    
Dividend payable     507,000   507,000      
Dividend payable date     Aug. 15, 2014         Nov. 14, 2014
Quarterly dividend declared     $ 0.03750 $ 0.03125 $ 0.07500 $ 0.06250   $ 0.0375
Dividend declaration date               Jul. 29, 2014
Dividend declared, date of record               Oct. 31, 2014
Stock repurchase program authorized amount             10,000,000  
Shares repurchased     0 245,575 0      
Shares repurchased, value       $ 3,200,000