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Derivative Financial Instruments - Additional Information (Detail) In Thousands, unless otherwise specified | 12 Months Ended | 1 Months Ended |  | 0 Months Ended | 12 Months Ended
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Dec. 31, 2014 Interest Rate Swap USD ($) | Dec. 31, 2013 Interest Rate Swap USD ($) | Dec. 31, 2014 W.E.T | Mar. 31, 2008 W.E.T Interest Rate Swap | Dec. 31, 2014 W.E.T Interest Rate Swap USD ($) | Dec. 31, 2014 W.E.T Interest Rate Swap EUR (€) | Mar. 25, 2013 Unicredit Bank EUR (€) | Dec. 31, 2014 Unicredit Bank USD ($) | Dec. 31, 2014 Unicredit Bank EUR (€)
Derivative Instruments [Line Items] |  |  |  |  |  |  |  |  |
Derivative maturity period |  |  |  | 10 years |  |  |  |  |
Notional Value |  |  |  |  | $ 12,133 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / dei_LegalEntityAxis = thrm_WetAutomotiveAgMember | € 10,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / dei_LegalEntityAxis = thrm_WetAutomotiveAgMember |  |  |
Variable Rate |  |  | six month EURIBOR |  |  |  |  |  |
Fixed interest rate |  |  | 0.17%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = thrm_WetAutomotiveAgMember |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.40%us-gaap_DerivativeBasisSpreadOnVariableRate / dei_LegalEntityAxis = thrm_WetAutomotiveAgMember |  |  |  |  |  |
Exchange rate |  |  | 1.20 thrm_CurrencyExchangeRate / dei_LegalEntityAxis = thrm_WetAutomotiveAgMember |  |  |  |  |  |
Derivative exchange rate |  |  | 1.46 us-gaap_DerivativeForwardExchangeRate1 / dei_LegalEntityAxis = thrm_WetAutomotiveAgMember |  |  |  |  |  |
Legal settlement for CRS |  |  |  |  |  |  | 144 us-gaap_LitigationSettlementAmount / dei_LegalEntityAxis = thrm_UnicreditBankMember |  |
Costs of all future obligations under CRS |  |  |  |  |  |  |  | 9,164 thrm_AmountOfPotentialFutureFinancialObligations / dei_LegalEntityAxis = thrm_UnicreditBankMember | 7,553 thrm_AmountOfPotentialFutureFinancialObligations / dei_LegalEntityAxis = thrm_UnicreditBankMember
Past due payments under CRS |  |  |  |  |  |  |  | 8,670 thrm_LitigationCostsPayable / dei_LegalEntityAxis = thrm_UnicreditBankMember | 7,146 thrm_LitigationCostsPayable / dei_LegalEntityAxis = thrm_UnicreditBankMember
Hedge Ineffectiveness Incurred | $ 0 us-gaap_DerivativeNetHedgeIneffectivenessGainLoss / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | $ 0 us-gaap_DerivativeNetHedgeIneffectivenessGainLoss / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of potential future financial obligations. + References No definition available. + Details
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- Definition Currency exchange rate. + References No definition available. + Details
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- Definition Derivative description of variable rate basis. + References No definition available. + Details
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- Details
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- Definition Litigation costs payable. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
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- Definition Contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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- Definition Amount of gain (loss) from the ineffectiveness of the hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
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