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v2.4.1.9

Reconciliations Between Statutory Federal Income Tax Rate and Effective Rate (Detail) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
Statutory Federal income tax rate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increase (Decrease) resulting from: |  |  |
U.S. Taxes on foreign income, net of taxes paid credit | (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | (1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | 4.50%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
NOLs recognized upon change in tax law |  |  | (2.90%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
Foreign, state and local tax, net of Federal benefit | 1.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 3.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 3.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Nondeductible expenses | 1.80%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense | 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense | 1.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Stock option compensation | (0.10%)thrm_EffectiveIncomeTaxRateReconciliationShareBasedCompensationCost | (0.50%)thrm_EffectiveIncomeTaxRateReconciliationShareBasedCompensationCost |
Research and development credits | (0.50%)thrm_EffectiveIncomeTaxRateReductionResearchAndDevelopmentTaxCredit | (2.30%)thrm_EffectiveIncomeTaxRateReductionResearchAndDevelopmentTaxCredit | (5.30%)thrm_EffectiveIncomeTaxRateReductionResearchAndDevelopmentTaxCredit
Effect of different tax rates of foreign jurisdictions | (10.00%)thrm_EffectiveIncomeTaxRateReconciliationChangeInForeignTaxRates | (10.80%)thrm_EffectiveIncomeTaxRateReconciliationChangeInForeignTaxRates | (10.50%)thrm_EffectiveIncomeTaxRateReconciliationChangeInForeignTaxRates
Other tax exempt income | (0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome |  | (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Other | (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther | 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther | 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther
Effective rate | 25.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 24.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 25.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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 Percentage 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 changes in the income tax rates. + 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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 Percentage 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 applicable to statutory income tax expense (benefit) outside of the country of domicile. + 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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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