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Cincinnati Sub-Zero Acquisition - Summary of Preliminary Allocation (Parenthetical) (Detail) $ in Thousands	Apr. 01, 2016 USD ($)
Cincinnati Sub-Zero Products, LLC
Business Acquisition [Line Items]
Consideration owed to seller for tax gross up	$ 2,000

X

- Definition

Consideration due to acquiree for tax gross up.

+ References

No definition available.

+ Details

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Namespace Prefix:	thrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=thrm_CincinnatiSubZeroProductsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: