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Estimated Useful Lives of Property and Equipment (Detail) | 12 Months Ended
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Dec. 31, 2012
Leasehold Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property plant and equipment, estimated useful life | Shorter of estimated life or term of lease
Capital Lease [Member] |
Property, Plant and Equipment [Line Items] |
Property plant and equipment, estimated useful life | Shorter of useful life or term of lease
Minimum [Member] | Plant And Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property plant and equipment, estimated useful life | 2 years
Minimum [Member] | Computer Equipment And Software [Member] |
Property, Plant and Equipment [Line Items] |
Property plant and equipment, estimated useful life | 1 year
Minimum [Member] | Production Tooling [Member] |
Property, Plant and Equipment [Line Items] |
Property plant and equipment, estimated useful life | 2 years
Minimum [Member] | Building [Member] |
Property, Plant and Equipment [Line Items] |
Property plant and equipment, estimated useful life | 5 years
Minimum [Member] | Furniture and Fixtures [Member] |
Property, Plant and Equipment [Line Items] |
Property plant and equipment, estimated useful life | 1 year
Maximum [Member] | Plant And Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property plant and equipment, estimated useful life | 20 years
Maximum [Member] | Computer Equipment And Software [Member] |
Property, Plant and Equipment [Line Items] |
Property plant and equipment, estimated useful life | 10 years
Maximum [Member] | Production Tooling [Member] |
Property, Plant and Equipment [Line Items] |
Property plant and equipment, estimated useful life | 5 years
Maximum [Member] | Building [Member] |
Property, Plant and Equipment [Line Items] |
Property plant and equipment, estimated useful life | 50 years
Maximum [Member] | Furniture and Fixtures [Member] |
Property, Plant and Equipment [Line Items] |
Property plant and equipment, estimated useful life | 15 years

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- Definition Property Plant And Equipment Useful Lives + References No definition available. + Details
Name: | thrm_PropertyPlantAndEquipmentUsefulLives
Namespace Prefix: | thrm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration