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Pension and Other Post Retirement Benefit Plans - Summary of Accumulated Benefit Obligations (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
United States |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ 3,446 | $ 3,847
German Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ 8,102 | $ 8,934

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- Definition Defined benefit plan accumulated benefit obligation net. + References No definition available. + Details
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Namespace Prefix: | thrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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