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Note 7 - Segment Reporting (Details) - Net Sales by Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue from External Customer [Line Items]
Net sales	$ 403,997us-gaap_SalesRevenueNet	$ 352,305us-gaap_SalesRevenueNet	$ 362,609us-gaap_SalesRevenueNet	$ 342,008us-gaap_SalesRevenueNet	$ 376,236us-gaap_SalesRevenueNet	$ 363,269us-gaap_SalesRevenueNet	$ 346,688us-gaap_SalesRevenueNet	$ 399,572us-gaap_SalesRevenueNet	$ 1,460,919us-gaap_SalesRevenueNet	$ 1,485,765us-gaap_SalesRevenueNet	$ 1,176,306us-gaap_SalesRevenueNet
Residential Power Products [Member]
Revenue from External Customer [Line Items]
Net sales									722,206us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_ResidentialPowerProductsMember	843,727us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_ResidentialPowerProductsMember	705,444us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_ResidentialPowerProductsMember
Commercial and Industrial Power Products [Member]
Revenue from External Customer [Line Items]
Net sales									652,216us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_CommercialAndIndustrialPowerProductsMember	569,890us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_CommercialAndIndustrialPowerProductsMember	410,341us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_CommercialAndIndustrialPowerProductsMember
Other Products and Services [Member]
Revenue from External Customer [Line Items]
Net sales									$ 86,497us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_OtherProductsAndServicesMember	$ 72,148us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_OtherProductsAndServicesMember	$ 60,521us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = gnrc_OtherProductsAndServicesMember

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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