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Earnings Per Share - Additional Information (Detail)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Antidilutive shares excluded from the diluted earnings per share calculations 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 37,500us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount