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Earnings Per Share - Additional Information (Detail) (Stock Options And Restricted Stock [Member])
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Stock Options And Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options, restricted stock and warrants excluded from the computation of diluted earnings per share 88,138 29,352 213,729 110,697