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Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Finite Lived Intangible Assets [Line Items] |  |
Gross Value | $ 121,885 us-gaap_FiniteLivedIntangibleAssetsGross | $ 127,905 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization | (53,756)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (44,474)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Value | 68,129 us-gaap_FiniteLivedIntangibleAssetsNet | 83,431 us-gaap_FiniteLivedIntangibleAssetsNet
Global Thermoelectric Inc |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Value | 9,406 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |
Accumulated Amortization | (1,465)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |
Net Value | 7,941 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember |
Global Thermoelectric Inc | Customer relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Value | 5,264 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Accumulated Amortization | (334)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Net Value | 4,930 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Estimated useful life of intangible assets | 12 years |
Global Thermoelectric Inc | Order backlog |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Value | 777 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember |
Accumulated Amortization | (777)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OrderOrProductionBacklogMember |
Estimated useful life of intangible assets | 6 months |
Global Thermoelectric Inc | Technology |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Value | 2,675 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember |
Accumulated Amortization | (204)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember |
Net Value | 2,471 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TechnologyBasedIntangibleAssetsMember |
Estimated useful life of intangible assets | 10 years |
Global Thermoelectric Inc | Trade Name |  |
Finite Lived Intangible Assets [Line Items] |  |
Gross Value | 690 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Accumulated Amortization | (150)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Net Value | $ 540 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Estimated useful life of intangible assets | 3 years 6 months |

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