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Earnings Per Share - Additional Information (Detail)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive options 79,925us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 59,542us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount