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Subsequent Events (Details) (Subsequent Event [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended
	Oct. 23, 2013 New Interest Rate Swaps [Member] Interest Rate Swap One [Member]	Oct. 23, 2013 New Interest Rate Swaps [Member] Interest Rate Swap Two [Member]	Oct. 07, 2013 Acquisition of Baldor [Member] Minimum [Member] kW	Oct. 07, 2013 Acquisition of Baldor [Member] Maximum [Member] MW
Subsequent Event [Line Items]
Units of power generators			3	2.5
Effective date	Jul. 01, 2014	Jul. 01, 2014
Derivative, notional amount	$ 100,000	$ 100,000
Derivative, fixed rate (in hundredths)	1.737%	1.7419%
Expiration date	Jul. 01, 2018	Jul. 01, 2018
Derivative, floor rate (in hundredths)	0.75%	0.75%

X

- Definition

Date the derivative contract become effective, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	gnrc_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Units of power generators used for the primary purpose of transmitting and distributing electricity to the consumer.

+ References

No definition available.

+ Details

Name:	gnrc_UnitsOfPowerGenerators
Namespace Prefix:	gnrc_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeMaturityDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Details

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