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Summary of Significant Accounting Policies and Basis of Presentation - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Line Items]      
Maturity period of cash equivalents 90 days    
Depreciation expense $ 14,930us-gaap_Depreciation $ 14,810us-gaap_Depreciation $ 14,298us-gaap_Depreciation
Share based compensation expense 8,601us-gaap_AllocatedShareBasedCompensationExpense 3,103us-gaap_AllocatedShareBasedCompensationExpense 823us-gaap_AllocatedShareBasedCompensationExpense
Related deferred tax benefit 2,006us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 1,887us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Ownership percentage in Gentherm GmbH   100.00%us-gaap_MinorityInterestOwnershipPercentageByParent  
Stock options outstanding under the 1993,1997, 2006 and 2011 Stock Option Plans      
Accounting Policies [Line Items]      
Share based compensation expense 8,601us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
3,103us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
823us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Related deferred tax benefit 2,949us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
419us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
301us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Production tooling      
Accounting Policies [Line Items]      
Reimbursable tooling capitalized within prepaid expenses and other current assets 2,298us-gaap_PrepaidExpenseAndOtherAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= thrm_ToolingMember
1,691us-gaap_PrepaidExpenseAndOtherAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= thrm_ToolingMember
 
Minimum      
Accounting Policies [Line Items]      
Payment terms of contracts 30 days    
Minimum | Production tooling      
Accounting Policies [Line Items]      
Property plant and equipment, estimated useful life 2 years    
Maximum      
Accounting Policies [Line Items]      
Payment terms of contracts 120 days    
Maximum | Production tooling      
Accounting Policies [Line Items]      
Property plant and equipment, estimated useful life 5 years    
Patents      
Accounting Policies [Line Items]      
Amortization of intangibles $ 16,941us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
$ 17,570us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
$ 15,817us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_PatentsMember
Concentration of Credit Risk | Accounts receivable | Johnson Controls Inc.      
Accounting Policies [Line Items]      
Percentage of accounts receivable balance 27.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= thrm_JohnsonControlsIncMember
27.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= thrm_JohnsonControlsIncMember
 
Concentration of Credit Risk | Accounts receivable | Lear Corporation      
Accounting Policies [Line Items]      
Percentage of accounts receivable balance 27.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= thrm_LearCorporationMember
24.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= thrm_LearCorporationMember
 
Concentration of Credit Risk | Accounts receivable | Magna International Inc.      
Accounting Policies [Line Items]      
Percentage of accounts receivable balance 5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= thrm_MagnaInternationalIncMember
7.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= thrm_MagnaInternationalIncMember