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Subsequent Events - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Mar. 05, 2014
Subsequent Event [Member]
Dividend Declared [Member]
Subsequent Event [Line Items]    
Dividend paid   $ 0.05
Dividend payment date Mar. 31, 2014  
Dividend payment record date Mar. 17, 2014