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Weighted Average Shares - Additional Information (Detail)
1 Months Ended 12 Months Ended
Jul. 28, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]        
Stock split conversion ratio 2 2    
Stock options to purchase anti-dilutive common stock   1,385,901 1,790,911 2,003,000