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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Commitments and Contingencies [Abstract] |  |
Amount financed by dealers | $ 25,132 | $ 16,600

X
- Definition Amount financed by dealers to purchase goods from the entity. + References No definition available. + Details
Name: | gnrc_AmountFinancedByDealers
Namespace Prefix: | gnrc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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