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Statutory Tax Rate and Effective Tax Rate (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statutory Tax Rate And Effective Tax Rate [Line Items]      
Statutory federal tax $ 11,093,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 13,665,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 9,925,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit 314,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 393,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 736,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign Taxes 73,000us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 0us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 0us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Domestic manufacturer deduction (811,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities (979,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities (902,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
FTC settlement 0us-gaap_IncomeTaxReconciliationNondeductibleExpense 0us-gaap_IncomeTaxReconciliationNondeductibleExpense 1,389,000us-gaap_IncomeTaxReconciliationNondeductibleExpense
Other permanent differences 200,000us-gaap_IncomeTaxReconciliationDeductionsOther 173,000us-gaap_IncomeTaxReconciliationDeductionsOther (190,000)us-gaap_IncomeTaxReconciliationDeductionsOther
Research and development and jobs credits (203,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment (459,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment (267,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment
Other state income tax benefits (113,000)us-gaap_IncomeTaxReconciliationTaxContingenciesOther (707,000)us-gaap_IncomeTaxReconciliationTaxContingenciesOther (686,000)us-gaap_IncomeTaxReconciliationTaxContingenciesOther
Other 111,000us-gaap_IncomeTaxReconciliationTaxCreditsOther (178,000)us-gaap_IncomeTaxReconciliationTaxCreditsOther (91,000)us-gaap_IncomeTaxReconciliationTaxCreditsOther
Income Tax Expense, Total $ 10,664,000us-gaap_IncomeTaxExpenseBenefit $ 11,908,000us-gaap_IncomeTaxExpenseBenefit $ 9,914,000us-gaap_IncomeTaxExpenseBenefit
Effective tax rate, Statutory federal tax 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Effective tax rate, State income taxes, net of federal benefit 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Effective Income Tax Rate Reconciliation, Foreign Taxes 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Effective tax rate, Domestic manufacturer deduction (2.60%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (2.50%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (3.20%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Effective tax rate, FTC settlement 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 4.90%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Effective tax rate, Other permanent differences 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther
Effective tax rate, Research and development and jobs credits (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseResearchAndDevelopment (1.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseResearchAndDevelopment (0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseResearchAndDevelopment
Effective tax rate, Other state income tax benefits (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesOther (1.80%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesOther (2.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesOther
Effective tax rate, Other 0.40%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther
Effective tax rate, Total 33.60%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 30.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits