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Summary of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Buildings | Minimum |
Property Plant And Equipment [Line Items] |
Property and equipment, Useful life | 5 years
Buildings | Maximum |
Property Plant And Equipment [Line Items] |
Property and equipment, Useful life | 50 years
Global Thermoelectric Inc |
Property Plant And Equipment [Line Items] |
Property and equipment | 716 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember
Global Thermoelectric Inc | Land |
Property Plant And Equipment [Line Items] |
Property and equipment | 15 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Property and equipment, Useful life | Indefinite
Global Thermoelectric Inc | Buildings |
Property Plant And Equipment [Line Items] |
Property and equipment | 81 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember
Property and equipment, Useful life | 20 years
Global Thermoelectric Inc | Leasehold improvements |
Property Plant And Equipment [Line Items] |
Property and equipment | 28 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember
Global Thermoelectric Inc | Leasehold improvements | Minimum |
Property Plant And Equipment [Line Items] |
Property and equipment, Useful life | 5 years
Global Thermoelectric Inc | Leasehold improvements | Maximum |
Property Plant And Equipment [Line Items] |
Property and equipment, Useful life | 7 years
Global Thermoelectric Inc | Machinery and Equipment |
Property Plant And Equipment [Line Items] |
Property and equipment | 423 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MachineryAndEquipmentMember
Global Thermoelectric Inc | Machinery and Equipment | Minimum |
Property Plant And Equipment [Line Items] |
Property and equipment, Useful life | 2 years
Global Thermoelectric Inc | Machinery and Equipment | Maximum |
Property Plant And Equipment [Line Items] |
Property and equipment, Useful life | 5 years
Global Thermoelectric Inc | Computer Hardware and Software |
Property Plant And Equipment [Line Items] |
Property and equipment | 169 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember
Global Thermoelectric Inc | Computer Hardware and Software | Minimum |
Property Plant And Equipment [Line Items] |
Property and equipment, Useful life | 3 years
Global Thermoelectric Inc | Computer Hardware and Software | Maximum |
Property Plant And Equipment [Line Items] |
Property and equipment, Useful life | 5 years

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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6539997&loc=d3e1205-110223 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |