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Subsequent Events - Additional Information (Detail) (USD $)
12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jan. 02, 2014
Subsequent Event [Member]
Jan. 30, 2014
Subsequent Event [Member]
Dec. 31, 2013
Subsequent Event [Member]
Subsequent Event [Line Items]            
Additional shares repurchased 7,257,000 0 0 675,000    
Common stock per share       $ 11.11    
Percentage of repurchase discount price           23.00%
Declared dividend         $ 0.10  
Dividend payment date         Mar. 03, 2014  
Dividend record date         Feb. 19, 2014