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Supplemental Pro Forma Information (Detail) (Global Thermoelectric Inc, USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Global Thermoelectric Inc |  |
Business Acquisition [Line Items] |  |
Product revenues | $ 824,311 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember | $ 694,697 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember
Net income | $ 71,997 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember | $ 35,348 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = thrm_GlobalThermoelectricIncMember

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