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Other - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended
Aug. 15, 2012
May 15, 2012
Feb. 15, 2012
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Nov. 02, 2012
Subsequent Event
Dividend Declared
Dividend Declared [Line Items]              
Cash dividend paid $ 312,000 $ 311,000 $ 311,000   $ 935,000 $ 604,000  
Accrual of dividend payable       $ 311,000 $ 311,000    
Dividend payable date       Nov. 15, 2012     Feb. 15, 2013
Cash dividends declared per common share       $ 0.025 $ 0.100 $ 0.050 $ 0.025
Shareholders recorded date of dividend             Feb. 01, 2013