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Earnings Per Share - Additional Information (Detail)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Average number of anti-dilutive options excluded from the calculation of diluted earnings per share 33,734us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 8,049us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount