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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Line Items]      
Operating loss carryforwards $ 1,387,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 883,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Valuation allowance for state tax net operating losses 108,000us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent 108,000us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent  
Unrecognized tax benefits 1,065,000us-gaap_UnrecognizedTaxBenefits 459,000us-gaap_UnrecognizedTaxBenefits 783,000us-gaap_UnrecognizedTaxBenefits
Potential increase (decrease) in income tax provision 700,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Possible reduction in unrecognized tax benefits resulting from audit settlements 300,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound    
Possible increase in unrecognized tax benefits resulting from audit settlements (300,000)us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound    
Interest expense related to income tax liabilities 1,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense    
Income tax penalties related to income tax liabilities 1,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense    
Proceeds from audited refund claim for tax $ 300,000us-gaap_ProceedsFromIncomeTaxRefunds    
Minimum [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards, expiration date Dec. 31, 2015    
Maximum [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards, expiration date Dec. 31, 2034