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Information Related to Recurring Fair Value Measurement of Derivative Instruments in Our Consolidated Balance Sheet (Detail) (Fair Value, Inputs, Level 2, USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Foreign Currency Derivatives | Not a hedge |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Asset Derivatives, Fair Value, Total | $ 1,490 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ 2,036 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Net Asset/(Liabilities) | 1,490 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 2,036 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Foreign Currency Derivatives | Not a hedge | Current Assets |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Asset Derivatives, Fair Value, Total | 145 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_BalanceSheetLocationAxis = thrm_CurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Net Asset/(Liabilities) | 145 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = thrm_CurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Foreign Currency Derivatives | Not a hedge | Current Assets | Contract One |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Asset Derivatives, Fair Value, Total |  | 1 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_BalanceSheetLocationAxis = thrm_CurrentAssetsMember / us-gaap_DerivativeByNatureAxis = thrm_ContractOneMember / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Net Asset/(Liabilities) |  | 1 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = thrm_CurrentAssetsMember / us-gaap_DerivativeByNatureAxis = thrm_ContractOneMember / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Foreign Currency Derivatives | Not a hedge | Current Assets | Contract Two |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Asset Derivatives, Fair Value, Total |  | 66 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_BalanceSheetLocationAxis = thrm_CurrentAssetsMember / us-gaap_DerivativeByNatureAxis = thrm_ContractTwoMember / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Net Asset/(Liabilities) |  | 66 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = thrm_CurrentAssetsMember / us-gaap_DerivativeByNatureAxis = thrm_ContractTwoMember / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Foreign Currency Derivatives | Not a hedge | Noncurrent Assets |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Asset Derivatives, Fair Value, Total | 1,345 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_BalanceSheetLocationAxis = thrm_NoncurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 1,969 us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_BalanceSheetLocationAxis = thrm_NoncurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Net Asset/(Liabilities) | 1,345 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = thrm_NoncurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 1,969 us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = thrm_NoncurrentAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = thrm_ForeignCurrencyDerivativesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Currency Related Swap |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Net Asset/(Liabilities) |  | (11,829)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Currency Related Swap | Not a hedge |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Liability Derivatives, Fair value | (9,164)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (11,829)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Net Asset/(Liabilities) | (9,164)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Currency Related Swap | Not a hedge | Current Liabilities |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Liability Derivatives, Fair value | (2,466)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = thrm_CurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (2,471)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = thrm_CurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Currency Related Swap | Not a hedge | Noncurrent Liabilities |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Liability Derivatives, Fair value | (6,698)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = thrm_NoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (9,358)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = thrm_NoncurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CurrencySwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Interest Rate Swap | Designated as Hedging Instrument | Current Liabilities |  |
Financial Instruments Measured At Fair Value On Recurring Basis [Line Items] |  |
Liability Derivatives, Fair value |  | (81)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = thrm_CurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Net Asset/(Liabilities) |  | $ (81)us-gaap_DerivativeFairValueOfDerivativeNet / us-gaap_BalanceSheetLocationAxis = thrm_CurrentLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember

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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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- Definition Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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