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Other - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended
May 15, 2013
Apr. 30, 2013
Feb. 15, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Aug. 02, 2013
Subsequent Event
Other [Line Items]                
Cash dividend paid $ 401,000   $ 319,000     $ 720,000 $ 622,000  
Dividend payable       397,000   397,000    
Quarterly dividend declared per share       $ 0.03125 $ 0.02500 $ 0.06250 $ 0.07500 $ 0.03125
Declared date of dividend               Aug. 02, 2013
Payable date of dividend               Nov. 15, 2013
Recorded date of dividend               Nov. 01, 2013
Stock repurchase program authorized   $ 10,000,000   $ 3,200,000        
Stock repurchase program authorized shares       245,575   245,575