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Estimated Useful Lives of Property and Equipment (Detail) | 12 Months Ended
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Dec. 31, 2013
Buildings | Minimum |
Property Plant And Equipment [Line Items] |
Property plant and equipment, estimated useful life | 5 years
Buildings | Maximum |
Property Plant And Equipment [Line Items] |
Property plant and equipment, estimated useful life | 50 years
Plant and Equipment | Minimum |
Property Plant And Equipment [Line Items] |
Property plant and equipment, estimated useful life | 2 years
Plant and Equipment | Maximum |
Property Plant And Equipment [Line Items] |
Property plant and equipment, estimated useful life | 20 years
Furniture, fixtures and fittings | Minimum |
Property Plant And Equipment [Line Items] |
Property plant and equipment, estimated useful life | 1 year
Furniture, fixtures and fittings | Maximum |
Property Plant And Equipment [Line Items] |
Property plant and equipment, estimated useful life | 20 years
Production tooling |
Property Plant And Equipment [Line Items] |
Property plant and equipment, estimated useful life | Estimated life of tool
Production tooling | Minimum |
Property Plant And Equipment [Line Items] |
Property plant and equipment, estimated useful life | 2 years
Production tooling | Maximum |
Property Plant And Equipment [Line Items] |
Property plant and equipment, estimated useful life | 5 years
Leasehold improvements |
Property Plant And Equipment [Line Items] |
Property plant and equipment, estimated useful life | Shorter of estimated life or term of lease
Computer equipment and software | Minimum |
Property Plant And Equipment [Line Items] |
Property plant and equipment, estimated useful life | 1 year
Computer equipment and software | Maximum |
Property Plant And Equipment [Line Items] |
Property plant and equipment, estimated useful life | 10 years
Capital Leases |
Property Plant And Equipment [Line Items] |
Property plant and equipment, estimated useful life | Shorter of useful life or term of lease

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- Definition Property Plant And Equipment Useful Lives. + References No definition available. + Details
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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