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Benefit Obligation, Amounts Recognized Company's Financial Statements and Principal Assumptions (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Change in projected benefit obligation: |  |
Benefit obligation at beginning of year | $ 1,848 us-gaap_DefinedBenefitPlanBenefitObligation | $ 1,633 us-gaap_DefinedBenefitPlanBenefitObligation
Service cost | 335 us-gaap_DefinedBenefitPlanServiceCost | 355 us-gaap_DefinedBenefitPlanServiceCost
Interest cost | 78 us-gaap_DefinedBenefitPlanInterestCost | 53 us-gaap_DefinedBenefitPlanInterestCost
Actuarial (gains)/losses | 213 us-gaap_DefinedBenefitPlanActuarialGainLoss | (193)us-gaap_DefinedBenefitPlanActuarialGainLoss
Net periodic benefit cost | 626 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost | 215 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Benefit obligation at end of year | 2,474 us-gaap_DefinedBenefitPlanBenefitObligation | 1,848 us-gaap_DefinedBenefitPlanBenefitObligation
Gentherm GmbH |  |
Change in projected benefit obligation: |  |
Benefit obligation at beginning of year | 6,019 us-gaap_DefinedBenefitPlanBenefitObligation / dei_LegalEntityAxis = thrm_GenthermGmbHMember | 5,392 us-gaap_DefinedBenefitPlanBenefitObligation / dei_LegalEntityAxis = thrm_GenthermGmbHMember
Service cost | 304 us-gaap_DefinedBenefitPlanServiceCost / dei_LegalEntityAxis = thrm_GenthermGmbHMember |
Interest cost | 181 us-gaap_DefinedBenefitPlanInterestCost / dei_LegalEntityAxis = thrm_GenthermGmbHMember | 180 us-gaap_DefinedBenefitPlanInterestCost / dei_LegalEntityAxis = thrm_GenthermGmbHMember
Paid pension distributions | (278)us-gaap_DefinedBenefitPlanBenefitsPaid / dei_LegalEntityAxis = thrm_GenthermGmbHMember | (291)us-gaap_DefinedBenefitPlanBenefitsPaid / dei_LegalEntityAxis = thrm_GenthermGmbHMember
Actuarial (gains)/losses | 1,385 us-gaap_DefinedBenefitPlanActuarialGainLoss / dei_LegalEntityAxis = thrm_GenthermGmbHMember | 43 us-gaap_DefinedBenefitPlanActuarialGainLoss / dei_LegalEntityAxis = thrm_GenthermGmbHMember
Past service cost | 1,271 thrm_DefinedBenefitPlanAmortizationOfPastServiceCostCredit / dei_LegalEntityAxis = thrm_GenthermGmbHMember | 445 thrm_DefinedBenefitPlanAmortizationOfPastServiceCostCredit / dei_LegalEntityAxis = thrm_GenthermGmbHMember
Exchange rate impact | (762)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation / dei_LegalEntityAxis = thrm_GenthermGmbHMember | 250 us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation / dei_LegalEntityAxis = thrm_GenthermGmbHMember
Benefit obligation at end of year | $ 8,120 us-gaap_DefinedBenefitPlanBenefitObligation / dei_LegalEntityAxis = thrm_GenthermGmbHMember | $ 6,019 us-gaap_DefinedBenefitPlanBenefitObligation / dei_LegalEntityAxis = thrm_GenthermGmbHMember

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- Definition Defined benefit plan amortization of past service cost credit. + References No definition available. + Details
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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6514294 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=6749293 + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=6506267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=6506309 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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