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Earnings Per Share - Additional Information (Detail) (Common Stock Equivalents)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Common Stock Equivalents
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Potentially dilutive securities excluded from computation of diluted earnings per common share 1,914,197 119,644 1,634,644 130,165