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Subsequent Events (Details) (Subsequent Event [Member], USD $) In Thousands, unless otherwise specified | Apr. 30, 2014
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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