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Information Related to Effect of Derivative Instruments on Our Consolidated Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | $ (1,071)us-gaap_DerivativeGainLossOnDerivativeNet | $ (2,088)us-gaap_DerivativeGainLossOnDerivativeNet
Other Comprehensive Income (Loss) |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | 81 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | 143 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember
Other Comprehensive Income (Loss) | Foreign Currency Derivatives |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | (10)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |
Revaluation of derivatives | Foreign Currency Derivatives |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | 640 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_IncomeStatementLocationAxis = thrm_RevaluationOfDerivativesMember | (1,327)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_IncomeStatementLocationAxis = thrm_RevaluationOfDerivativesMember
Revaluation of derivatives | Currency Related Swap |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | (1,157)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_IncomeStatementLocationAxis = thrm_RevaluationOfDerivativesMember | 2,335 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_IncomeStatementLocationAxis = thrm_RevaluationOfDerivativesMember
Revaluation of derivatives | Interest Rate Swap |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | (1)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_IncomeStatementLocationAxis = thrm_RevaluationOfDerivativesMember | (2)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_IncomeStatementLocationAxis = thrm_RevaluationOfDerivativesMember
Product Revenues | Foreign Currency Derivatives |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | (390)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_IncomeStatementLocationAxis = thrm_ProductRevenuesMember |
Cost of Sales | Foreign Currency Derivatives |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | (174)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |
Selling, General and Administrative Expense | Foreign Currency Derivatives |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | (161)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |
Foreign Currency Gain (Loss) | Foreign Currency Derivatives |  |
Derivative Instruments Gain Loss [Line Items] |  |
Gain (loss) on derivatives | $ (976)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember | $ (761)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_IncomeStatementLocationAxis = us-gaap_ForeignCurrencyGainLossMember

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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