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Other - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Aug. 15, 2014
May 15, 2014
Feb. 15, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Apr. 30, 2013
Maximum
Nov. 05, 2014
Subsequent Event
Other [Line Items]                  
Cash dividend paid $ 510,000 $ 506,000 $ 501,000     $ 1,517,000 $ 1,117,000    
Dividend payable       510,000   510,000      
Dividend payable date       Nov. 14, 2014         Feb. 13, 2015
Quarterly dividend declared       $ 0.03750 $ 0.03125 $ 0.11250 $ 0.09375   $ 0.0375
Dividend declaration date                 Nov. 05, 2014
Dividend declared, date of record                 Jan. 30, 2015
Stock repurchase program authorized amount               10,000,000  
Shares repurchased       0   0 245,575    
Shares repurchased, value             $ 3,200,000