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Summary of Purchase Price Allocation (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
Purchase price | 31,474 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |
Global Thermoelectric Inc |  |  |
Business Acquisition [Line Items] |  |  |
Accounts receivable | 10,200 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Inventory | 6,487 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Deferred income tax assets, net | 3,499 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Prepaid expenses and other assets | 258 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Property and equipment | 716 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Goodwill | 6,258 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Assumed liabilities | (6,530)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / 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 |  |
Purchase price | 33,820 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |  |
Global Thermoelectric Inc | Order backlog |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 815 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember |  |
Global Thermoelectric Inc | Customer relationships |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 5,524 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |
Global Thermoelectric Inc | Technology |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | 2,807 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember |  |
Global Thermoelectric Inc | Trade Name |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets | $ 725 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |

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