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Earnings Per Share - Additional Information (Detail)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Computation Of Earnings Per Share Line Items    
Shares not included in computing diluted earnings per share because effects were anti-dilutive 76,207us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 76,067us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount