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Earnings per Share Data (Detail)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Antidilutive securities excluded from computation of earnings per share (in shares) 1,851us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 2,458us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount