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Principal Maturities of Debt (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Debt Instrument [Line Items] |  |
Debt maturing in 2015 | $ 5,306 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |
Debt maturing in 2016 | 5,138 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |
Debt maturing in 2017 | 6,531 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |
Debt maturing in 2018 | 6,996 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |
Debt maturing in 2019 | 66,804 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |
Total debt | 90,775 us-gaap_LongTermDebt | 82,320 us-gaap_LongTermDebt
US Term Note |  |
Debt Instrument [Line Items] |  |
Debt maturing in 2015 | 2,500 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = thrm_UnitedStateTermLoanMember |
Debt maturing in 2016 | 2,812 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = thrm_UnitedStateTermLoanMember |
Debt maturing in 2017 | 3,750 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = thrm_UnitedStateTermLoanMember |
Debt maturing in 2018 | 4,063 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = thrm_UnitedStateTermLoanMember |
Debt maturing in 2019 | 36,250 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = thrm_UnitedStateTermLoanMember |
Total debt | 49,375 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = thrm_UnitedStateTermLoanMember |
Europe Term Loan |  |
Debt Instrument [Line Items] |  |
Debt maturing in 2015 | 1,213 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = thrm_EuropeTermLoanMember |
Debt maturing in 2016 | 1,365 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = thrm_EuropeTermLoanMember |
Debt maturing in 2017 | 1,820 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = thrm_EuropeTermLoanMember |
Debt maturing in 2018 | 1,972 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = thrm_EuropeTermLoanMember |
Debt maturing in 2019 | 17,593 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = thrm_EuropeTermLoanMember |
Total debt | 23,963 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = thrm_EuropeTermLoanMember |
US Revolving Note |  |
Debt Instrument [Line Items] |  |
Debt maturing in 2019 | 12,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = thrm_UnitedStateRevolvingNoteMember |
Total debt | 12,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = thrm_UnitedStateRevolvingNoteMember |
DEG Loan |  |
Debt Instrument [Line Items] |  |
Debt maturing in 2015 | 961 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = thrm_DEGLoanMember |
Debt maturing in 2016 | 961 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = thrm_DEGLoanMember |
Debt maturing in 2017 | 961 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = thrm_DEGLoanMember |
Debt maturing in 2018 | 961 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = thrm_DEGLoanMember |
Debt maturing in 2019 | 961 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = thrm_DEGLoanMember |
Total debt | 4,805 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = thrm_DEGLoanMember | 5,561 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = thrm_DEGLoanMember
Capital Lease |  |
Debt Instrument [Line Items] |  |
Debt maturing in 2015 | 632 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember |
Total debt | $ 632 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember | $ 2,440 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_CapitalLeaseObligationsMember

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