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