XML 59 R48.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Debt - Additional Information (Detail) | 9 Months Ended
--- | ---
Sep. 30, 2018 USD ($)
Debt Instrument [Line Items] |
Maximum percentage of stock of non US subsidiaries pledge to secure obligation | 66.00%
Federal Funds Rate | Minimum |
Debt Instrument [Line Items] |
Interest rate | 0.50%
Federal Funds Rate | Maximum |
Debt Instrument [Line Items] |
Interest rate | 2.18%
London Interbank Offered Rate |
Debt Instrument [Line Items] |
Interest rate | 2.26%
Revolving Note (U.S. Dollar) |
Debt Instrument [Line Items] |
Undrawn borrowing capacity | $ 260,758,000
Debt maturity date | Mar. 17, 2021
United State Bank Of America Credit Facility |
Debt Instrument [Line Items] |
Interest rate | 5.25%
Euro Currency Rate Loans | Minimum |
Debt Instrument [Line Items] |
Interest rate | 0.00%
Euro Currency Rate Loans | Minimum | Amended Credit Agreement |
Debt Instrument [Line Items] |
Interest rate | 1.25%
Euro Currency Rate Loans | Maximum |
Debt Instrument [Line Items] |
Interest rate | 1.00%
Euro Currency Rate Loans | Maximum | Amended Credit Agreement |
Debt Instrument [Line Items] |
Interest rate | 2.00%
Base Rate Loans | Minimum | Amended Credit Agreement |
Debt Instrument [Line Items] |
Interest rate | 0.25%
Base Rate Loans | Maximum | Amended Credit Agreement |
Debt Instrument [Line Items] |
Interest rate | 1.00%
DEG Loan |
Debt Instrument [Line Items] |
Semi-annual principal payments earliest date | 2015-03
Semi-annual principal payments latest date | 2019-09
DEG Vietnam Loan |
Debt Instrument [Line Items] |
Semi-annual principal payments earliest date | 2017-11
Semi-annual principal payments latest date | 2023-05
Revolving Credit Facility | Revolving Note (U.S. Dollar) |
Debt Instrument [Line Items] |
Maximum borrowing capacity | $ 350,000,000

X
- Definition Debt instrument maturity month and year range end. + References No definition available. + Details
Name: | thrm_DebtInstrumentMaturityMonthAndYearRangeEnd
Namespace Prefix: | thrm_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instrument maturity month and year range start. + References No definition available. + Details
Name: | thrm_DebtInstrumentMaturityMonthAndYearRangeStart
Namespace Prefix: | thrm_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of stock interest on subsidiaries pledge to secure obligation. + References No definition available. + Details
Name: | thrm_PercentageOfStockInterestOnSubsidiariesPledgeToSecureObligation
Namespace Prefix: | thrm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=thrm_UnitedStateRevolvingNoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=thrm_UnitedStateBankOfAmericaCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=thrm_EuroCurrencyRateLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=thrm_AmendedCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=thrm_BaseRateLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=thrm_DEGLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=thrm_DEGVietnamLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |