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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Provision for income taxes $ 351,000us-gaap_IncomeTaxExpenseBenefit $ 276,000us-gaap_IncomeTaxExpenseBenefit  
Effective tax rate 29.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 26.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Net deferred tax assets $ 7,700,000us-gaap_DeferredTaxAssetsLiabilitiesNet   $ 7,900,000us-gaap_DeferredTaxAssetsLiabilitiesNet