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Earnings Per Share - Anti-dilutive Securities Excluded from Computation of Earnings Per Share (Detail)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Anti-dilutive securities:    
Total anti-dilutive securities 70,925us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 253,427us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Share-based compensation awards    
Anti-dilutive securities:    
Total anti-dilutive securities 18,683us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
134,682us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember
Warrants    
Anti-dilutive securities:    
Total anti-dilutive securities 52,242us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
118,745us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember