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Earnings Per Share Reconciliation - Additional Information (Detail)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Antidilutive securities excluded from computation of earnings per common share 235,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 130,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount