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Subsequent Event - Additional Information (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Feb. 10, 2016
Subsequent Event [Line Items]    
Dividend declared date Feb. 10, 2016  
Dividend record date Mar. 18, 2016  
Dividend payable date Mar. 04, 2016  
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Cash dividend declared amount   $ 0.03