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Earnings Per Share Reconciliation - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per common share 222,000 688,000 199,000 1,200,000