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Company - Additional Information (Detail) (W.E.T.) | 12 Months Ended
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Dec. 31, 2012 Item
W.E.T. |
Nature Of Company [Line Items] |
Number of employees | 6,000
Number of locations | 14

X
- Definition Number of persons employed by the Entity + References No definition available. + Details
Name: | dei_EntityNumberOfEmployees
Namespace Prefix: | dei_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | thrm_NatureOfCompanyLineItems
Namespace Prefix: | thrm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Locations + References No definition available. + Details
Name: | thrm_NumberOfLocations
Namespace Prefix: | thrm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration