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Earnings Per Share - Number of Potential Common Shares that have been Excluded from Computation of Diluted Earnings Per Share for Indicated Period Due to Their Anti-Dilutive Nature (Detail)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Potential common shares 277us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 7us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 8us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount