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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
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

X

- Details

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