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Subsequent Event - Additional Information (Detail) - $ / shares
6 Months Ended
Aug. 12, 2015
Jun. 30, 2015
Subsequent Event [Line Items]    
Dividend declared date   Aug. 12, 2015
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Cash dividend declared amount $ 0.025  
Dividend record date Sep. 18, 2015  
Dividend payable date Sep. 04, 2015