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Note 3 - Acquisitions (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 01, 2014 | Aug. 01, 2013 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 08, 2012 | Jun. 30, 2013
Note 3 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 61,196 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 116,113 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 47,044 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |  |  |
Goodwill | 635,565 us-gaap_Goodwill | 608,287 us-gaap_Goodwill | 552,943 us-gaap_Goodwill |  |  | 608,287 us-gaap_Goodwill |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | (4,877)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 |  |  |  |  |  |  |  |
Acquisition of MAC, Inc [Member] |  |  |  |  |  |  |  |  |
Note 3 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | 55,690 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfMACIncMember |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill |  |  |  | 49,378 gnrc_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfMACIncMember |  |  |  |  |
Goodwill |  |  |  | 25,898 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfMACIncMember |  |  |  |  |
Acquisition of Tower Light [Member] |  |  |  |  |  |  |  |  |
Note 3 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  | 80,239 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfTowerLightMember |  |  |  |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill |  |  |  |  |  |  | 67,900 gnrc_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfTowerLightMember |  |
Goodwill |  |  |  |  |  |  | 38,400 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfTowerLightMember |  |
Business Combination, Consideration Transferred |  |  |  |  | 85,812 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfTowerLightMember |  |  |  |
Number of Countries in Which Subsidiary of Entity Built Leading Market Position in Equipment Rental Markets |  |  |  |  | 50 gnrc_NumberOfCountriesInWhichSubsidiaryOfEntityBuiltLeadingMarketPositionInEquipmentRentalMarkets / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfTowerLightMember |  |  |  |
Restricted Cash and Cash Equivalents |  |  |  |  | 6,645 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfTowerLightMember |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred | 7,641 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfTowerLightMember |  |  |  |  |  | (300)us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfTowerLightMember |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | 4,877 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfTowerLightMember |  |  |  |  |  |  |  |
Additional Goodwill Recorded Under Revised Purchase Accounting Estimate |  |  |  |  |  | 9,328 gnrc_AdditionalGoodwillRecordedUnderRevisedPurchaseAccountingEstimate / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfTowerLightMember |  |  |
Acquisition of Ottomores [Member] |  |  |  |  |  |  |  |  |
Note 3 - Acquisitions (Details) [Line Items] |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  |  | 44,769 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfOttomoresMember |
Business Acquisition, Purchase Price Allocation, Intangible Assets Including Goodwill |  |  | 16,100 gnrc_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsIncludingGoodwill / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfOttomoresMember |  |  |  |  |  |
Goodwill |  |  | 5,050 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfOttomoresMember |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred |  |  |  |  |  |  |  |  | 6,278 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfOttomoresMember
Increase (Decrease) in Intangible Assets Non-current |  |  |  |  |  |  |  |  | 2,590 gnrc_IncreaseDecreaseInIntangibleAssetsNonCurrent / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfOttomoresMember
Goodwill, Period Increase (Decrease) |  |  |  |  |  |  |  |  | $ 439 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_BusinessAcquisitionAxis = gnrc_AcquisitionOfOttomoresMember

X
- Definition Information regarding additional goodwill recorded under revised purchase accounting estimate. + References No definition available. + Details
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- 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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- Definition The increase (decrease) during the reporting period in intangible assets (for example patents and licenses). + References No definition available. + Details
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- Definition Refers to the number of countries in which a subsidiary of the Company has built a leading market position in the equipment rental markets. + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1500-128463 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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