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Gentherm Global Power Technologies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |
Goodwill | $ 30,398 us-gaap_Goodwill | $ 25,809 us-gaap_Goodwill | $ 24,729 us-gaap_Goodwill
Global Thermoelectric Inc |  |  |
Business Acquisition [Line Items] |  |  |
Product revenues | 24,235 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Operating Income | 776 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Net assets acquired | 30,759 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Cash acquired on acquisition | 3,061 us-gaap_CashAcquiredFromAcquisition / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Goodwill | 6,258 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Intangible Assets before Foreign Currency Adjustment | 9,871 thrm_FiniteLivedIntangibleAssetsGrossBeforeForeignCurrencyAdjustment / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Decrease in intangible assets, net of accumulated amortization, fluctuations in foreign currency exchange rates | 465 us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Amortization of intangibles | $ 1,962 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |

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