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Note 9 - Goodwill and Intangible Assets (Details) - Carrying Amount of Goodwill (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Carrying Amount of Goodwill [Abstract]
Balance at beginning of year	$ 1,111,480us-gaap_GoodwillGross	$ 1,056,136us-gaap_GoodwillGross
Balance at beginning of year	(503,193)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss	(503,193)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Balance at beginning of year	608,287us-gaap_Goodwill	552,943us-gaap_Goodwill
Acquisitions of businesses, net	27,278us-gaap_GoodwillAcquiredDuringPeriod	56,605us-gaap_GoodwillAcquiredDuringPeriod
Acquisitions of businesses, net	0gnrc_GoodwillAcquiredDuringPeriodImpairmentLoss	0gnrc_GoodwillAcquiredDuringPeriodImpairmentLoss
Acquisitions of businesses, net	27,278gnrc_GoodwillAcquiredDuringPeriodNet	56,605gnrc_GoodwillAcquiredDuringPeriodNet
Sale of business, net	0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit	(1,261)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
Sale of business, net	0gnrc_AccumulatedImpairmentOnGoodwillRelatedToSaleOfBusiness	0gnrc_AccumulatedImpairmentOnGoodwillRelatedToSaleOfBusiness
Sale of business, net	0gnrc_GoodwillRelatedToSaleOfBusinessNet	(1,261)gnrc_GoodwillRelatedToSaleOfBusinessNet
Balance at end of year	1,138,758us-gaap_GoodwillGross	1,111,480us-gaap_GoodwillGross
Balance at end of year	(503,193)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss	(503,193)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Balance at end of year	$ 635,565us-gaap_Goodwill	$ 608,287us-gaap_Goodwill

X

- Definition

The impairment losses related to goodwill sold in the period.

+ References

No definition available.

+ Details

Name:	gnrc_AccumulatedImpairmentOnGoodwillRelatedToSaleOfBusiness
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	gnrc_CarryingAmountOfGoodwillAbstract
Namespace Prefix:	gnrc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The impairment losses related to goodwill acquired in the period.

+ References

No definition available.

+ Details

Name:	gnrc_GoodwillAcquiredDuringPeriodImpairmentLoss
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of goodwill acquired before evaluation of impairment, in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References

No definition available.

+ Details

Name:	gnrc_GoodwillAcquiredDuringPeriodNet
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This line item represents the net goodwill related to the sale of business. Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets sold in one or more business combination transactions.

+ References

No definition available.

+ Details

Name:	gnrc_GoodwillRelatedToSaleOfBusinessNet
Namespace Prefix:	gnrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount before 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/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a,h)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of accumulated impairment loss for 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/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a,h)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of divestiture 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/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration