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Earnings (Loss) Per Share - Potentially Dilutive Securities Excluded from Earnings (Loss) Per Share Calculation (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Potentially dilutive shares 175,902us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 168,472us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,753,311us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount