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Fair Value Measurement - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Fair Value Disclosures [Abstract] |  |
Financial assets, fair value | $ 0 thrm_FinancialAssetsFairValueDisclosure | $ 0 thrm_FinancialAssetsFairValueDisclosure
Financial liabilities, fair value | 0 us-gaap_FinancialLiabilitiesFairValueDisclosure | 0 us-gaap_FinancialLiabilitiesFairValueDisclosure
Changes to fair value of assets, realized | $ 0 us-gaap_AssetsFairValueAdjustment | $ 0 us-gaap_AssetsFairValueAdjustment

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- Definition Financial assets fair value disclosure. + References No definition available. + Details
Name: | thrm_FinancialAssetsFairValueDisclosure
Namespace Prefix: | thrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of addition (reduction) to the amount at which an asset could be incurred (settled) in a current transaction between willing parties. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueAdjustment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
Name: | us-gaap_FinancialLiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant