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Earnings Per Share - Additional Information (Detail) (Options [Member])
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Options [Member]
       
Earnings Per Share [Line Items]        
Antidilutive options 752,924 136,962 752,924 136,962