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Commitments and Contingencies - Additional Information (Detail) | Feb. 14, 2024 Vehicle
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Loss Contingency [Abstract] |
Number of vehicles recalled | 261,257

X
- Definition Number of vehicles recalled. + References No definition available. + Details
Name: | thrm_NumberOfVehiclesRecalled
Namespace Prefix: | thrm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LossContingencyAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration