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Earnings Per Share - Additional Information (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Average number of anti-dilutive options excluded from the calculation of diluted earnings per share 36,775us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount    1,380us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount