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The Company - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 1 Months Ended
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Dec. 31, 2014 Segment | Feb. 28, 2014
Nature Of Company [Line Items] |  |
Number of reportable segments | 2 us-gaap_NumberOfReportableSegments |
Number of operating segments | 3 us-gaap_NumberOfOperatingSegments |
North American Electronics Manufacturing Joint Venture |  |
Nature Of Company [Line Items] |  |
Gain realized from step acquisition of subsidiary |  | $ 785 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = thrm_NorthAmericanElectronicsManufacturingJointVentureMember

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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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