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Note 10 - Product Warranty Obligations (Details) - Reconciliation of Product Warranty Liability (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Product Warranty Liability [Abstract]
Balance at beginning of year	$ 33,734us-gaap_StandardProductWarrantyAccrual	$ 36,111us-gaap_StandardProductWarrantyAccrual	$ 24,643us-gaap_StandardProductWarrantyAccrual
Payments	(20,615)us-gaap_StandardProductWarrantyAccrualPayments	(18,484)us-gaap_StandardProductWarrantyAccrualPayments	(19,801)us-gaap_StandardProductWarrantyAccrualPayments
Provision for warranties issued	22,890us-gaap_StandardProductWarrantyAccrualWarrantiesIssued	33,707us-gaap_StandardProductWarrantyAccrualWarrantiesIssued	34,173us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Changes in estimates for pre-existing warranties	(5,100)us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease	(17,600)us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease	(2,904)us-gaap_StandardProductWarrantyAccrualPreexistingIncreaseDecrease
Balance at end of year	30,909us-gaap_StandardProductWarrantyAccrual	33,734us-gaap_StandardProductWarrantyAccrual	36,111us-gaap_StandardProductWarrantyAccrual
Balance at beginning of year	23,092us-gaap_ExtendedProductWarrantyAccrual	13,474us-gaap_ExtendedProductWarrantyAccrual	9,737us-gaap_ExtendedProductWarrantyAccrual
Deferred revenue on extended warranty contracts sold	7,343us-gaap_ExtendedProductWarrantyAccrualWarrantiesIssued	11,998us-gaap_ExtendedProductWarrantyAccrualWarrantiesIssued	5,547us-gaap_ExtendedProductWarrantyAccrualWarrantiesIssued
Amortization of deferred revenue on extended warranty contracts	(3,242)gnrc_AmortizationOfDeferredRevenueOnExtendedWarrantyContracts	(2,380)gnrc_AmortizationOfDeferredRevenueOnExtendedWarrantyContracts	(1,810)gnrc_AmortizationOfDeferredRevenueOnExtendedWarrantyContracts
Balance at end of year	$ 27,193us-gaap_ExtendedProductWarrantyAccrual	$ 23,092us-gaap_ExtendedProductWarrantyAccrual	$ 13,474us-gaap_ExtendedProductWarrantyAccrual

X

- Definition

Represents the aggregate decrease in the liability for accruals related to extended product warranties issued during the reporting period, due to amortization of deferred revenue.

+ References

No definition available.

+ Details

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Period Type:	duration

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Balance Type:	na
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X

- Definition

Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(1),(c)(5)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

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Period Type:	instant

X

- Definition

Represents the aggregate increase in the liability for accruals related to extended product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to standard product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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X

- Definition

Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(1),(c)(5)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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X

- Definition

Represents the aggregate decrease in the liability for payments made (in cash or in kind) to satisfy claims under the terms of the standard product warranty. Does not include any Increase or Decrease in the liability for payments related to extended product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(2))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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X

- Definition

Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard product warranties (including adjustments related to changes in estimates). Does not include any Increase or Decrease in the liability for accruals related to extended product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(4))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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X

- Definition

Represents the aggregate increase in the liability for accruals related to standard product warranties issued during the reporting period. Does not include any increase in the liability for accruals related to extended product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(3))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

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