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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       $ 50,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= thrm_UnitedStateTermLoanMember
€ 20,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= thrm_EuropeTermLoanMember
                   
Secured long-term debt     100,000us-gaap_SecuredLongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
                       
Line of credit facility     50,000us-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   1,370us-gaap_DebtInstrumentUnamortizedDiscount                          
Financing costs incurred 1,139us-gaap_DebtIssuanceCosts                            
Deferred financing costs $ 451us-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