XML 21 R26.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Segment Reporting - Additional Information (Detail) (Advanced Technology, USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Advanced Technology |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Reimbursed research and development costs | $ 375 | $ 656 | $ 1,597 | $ 1,763

X
- Definition Research and development reimbursements. + References No definition available. + Details
Name: | thrm_ResearchAndDevelopmentReimbursements
Namespace Prefix: | thrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration