Receivables transferred.

No definition available.

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Namespace Prefix:	thrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase from purchase of accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 11
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447

+ Details

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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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- Definition

Amount of gain (loss) from the ineffectiveness of the hedge.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
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+ Details

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Period Type:	instant

- Definition

Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Details

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- Details

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- Details

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- Details

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Financial Instruments - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative [Line Items]
Maximum length of time to hedges exposure to foreign currency exchange risk					15 months
Receivables transferred	$ 0
Maximum
Derivative [Line Items]
Aggregate purchases of accounts receivable		$ 41,300,000
Foreign Currency Derivatives
Derivative [Line Items]
Notional Value	8,985,000		$ 8,985,000		$ 8,985,000		$ 13,299,000
Copper Commodity Swap Contracts
Derivative [Line Items]
Notional Value	$ 1,237,000		1,237,000		1,237,000		$ 0
Interest Rate Swap
Derivative [Line Items]
Hedge Ineffectiveness Incurred			$ 0	$ 0	$ 0	$ 0