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Dividend - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Disclosure Of Dividends [Line Items]    
Cash dividend declared monthly (per share) $ 0.005 $ 0.005
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Disclosure Of Dividends [Line Items]    
Cash dividend declared monthly (per share) $ 0.020