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Percentage of Total Product Revenues Generated from Customers (Detail) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Johnson Controls Inc. |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of total product revenues generated from customer | 24.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = thrm_JohnsonControlsIncMember | 27.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = thrm_JohnsonControlsIncMember | 22.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = thrm_JohnsonControlsIncMember
Lear Corporation |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of total product revenues generated from customer | 21.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = thrm_LearCorporationMember | 18.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = thrm_LearCorporationMember | 18.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = thrm_LearCorporationMember
Bosch |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of total product revenues generated from customer | 9.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = thrm_BoschMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = thrm_BoschMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / dei_LegalEntityAxis = thrm_BoschMember

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