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Debt - Additional Information (Detail) In Thousands, unless otherwise specified | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Aug. 07, 2014 USD ($) | Aug. 07, 2014 Revolving Credit Facility USD ($) | Aug. 07, 2014 US Term Note USD ($) | Aug. 07, 2014 Europe Term Loan EUR (€) | Aug. 07, 2014 Federal Funds Purchased Minimum | Aug. 07, 2014 Federal Funds Purchased Maximum | Dec. 31, 2014 US Bank of America credit facility Maximum | Dec. 31, 2014 Eurocurrency Rate Loans | Aug. 07, 2014 Eurocurrency Rate Loans Minimum | Dec. 31, 2014 Eurocurrency Rate Loans Minimum | Dec. 31, 2014 Eurocurrency Rate Loans Maximum | Dec. 31, 2014 Base Rate Loans | Dec. 31, 2014 Base Rate Loans Minimum | Dec. 31, 2014 Base Rate Loans Maximum
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured term loan facility borrowing capacity |  |  |  | $ 50,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = thrm_UnitedStateTermLoanMember | € 20,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = thrm_EuropeTermLoanMember |  |  |  |  |  |  |  |  |  |
Secured long-term debt |  |  | 100,000 us-gaap_SecuredLongTermDebt / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  | 50,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of stock of non US subsidiaries pledge to secure obligation |  | 66.00%thrm_PercentageOfStockInterestOnSubsidiariesPledgeToSecureObligation |  |  |  |  |  |  |  |  |  |  |  |  |
Debt retirement expense |  | 1,370 us-gaap_DebtInstrumentUnamortizedDiscount |  |  |  |  |  |  |  |  |  |  |  |  |
Financing costs incurred | 1,139 us-gaap_DebtIssuanceCosts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs | $ 451 us-gaap_DeferredFinanceCostsNoncurrentGross |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility maturity date | Aug. 07, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 0.06%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 0.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 3.25%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = thrm_UnitedStateBankOfAmericaCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 1.75%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = thrm_EuroCurrencyRateLoansMember | 1.00%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = thrm_EuroCurrencyRateLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 1.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = thrm_EuroCurrencyRateLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 2.00%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = thrm_EuroCurrencyRateLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 0.75%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = thrm_BaseRateLoansMember | 0.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = thrm_BaseRateLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 1.00%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_LongtermDebtTypeAxis = thrm_BaseRateLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Semi-annual principal payments earliest date | 2015-03 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Semi-annual principal payments latest date | 2019-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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- Definition Gross amount, as of the balance sheet date, of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings in periods after one year or beyond the normal operating cycle, if longer, over the life of the long-term debt instruments to which such costs pertain. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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