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Subsequent Events (Details) (Subsequent Event [Member], USD $) In Thousands, unless otherwise specified	Apr. 30, 2014
Subsequent Event [Member]
Subsequent Event [Line Items]
Prepaid new term loan	$ 12,000

X

- Definition

The carrying amount of the prepaid new term loan.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration