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Earnings Per Share - Securities Not Included in Computation of Diluted Earnings Per Share (Detail)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Options to purchase shares of common stock 26us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 9us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount