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Note 2 - Acquisitions (Details Textual) - USD ($) $ in Thousands			3 Months Ended	6 Months Ended
	Jun. 01, 2021	Oct. 07, 2020	Sep. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Payments to Acquire Businesses, Net of Cash Acquired, Total				$ 419,017	$ (0)
Goodwill, Ending Balance				$ 1,109,908		$ 855,228
Acquisition of Deep Sea [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total	$ 420,700
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill	437,120
Goodwill, Ending Balance	$ 264,975
Acquisition of Enbala [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total		$ 41,982
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill		46,645
Goodwill, Ending Balance		$ 27,345
Other 2020 Acquisitions [Member]
Payments to Acquire Businesses, Net of Cash Acquired, Total			$ 20,905

X

- Definition

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset including goodwill.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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X

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

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X

- Details

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X

- Details

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X

- Details

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