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Statutory Tax Rate and Effective Tax Rate (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statutory Tax Rate And Effective Tax Rate [Line Items] |  |  |
Statutory federal tax | $ 11,093,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 13,665,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 9,925,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit | 314,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 393,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 736,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign Taxes | 73,000 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 0 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 0 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Domestic manufacturer deduction | (811,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (979,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (902,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
FTC settlement | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpense | 1,389,000 us-gaap_IncomeTaxReconciliationNondeductibleExpense
Other permanent differences | 200,000 us-gaap_IncomeTaxReconciliationDeductionsOther | 173,000 us-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 | 111,000 us-gaap_IncomeTaxReconciliationTaxCreditsOther | (178,000)us-gaap_IncomeTaxReconciliationTaxCreditsOther | (91,000)us-gaap_IncomeTaxReconciliationTaxCreditsOther
Income Tax Expense, Total | $ 10,664,000 us-gaap_IncomeTaxExpenseBenefit | $ 11,908,000 us-gaap_IncomeTaxExpenseBenefit | $ 9,914,000 us-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

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in other income tax contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other tax credits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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