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Financial Instruments - Summary of Trade Receivables Sold and Factoring Fees Incurred (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | [1]
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Trade receivables sold | $ 135,116 | $ 61,482
Factoring fees incurred | $ 800 | $ 180
[1] | Represents trade receivables sold and factoring fees incurred since the acquisition of Alfmeier (acquired on August 1, 2022).

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- Definition Factoring fees. + References No definition available. + Details
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Namespace Prefix: | thrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Proceeds from securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration