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Other - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended
May 15, 2012
Feb. 15, 2012
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2011
Dividend Declared [Line Items]          
Cash dividend paid $ 311,000 $ 311,000   $ 622,000 $ 302,000
Accrual of dividend payable     $ 312,000 $ 312,000  
Dividend payable date     Aug. 15, 2012