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Customer Acquisitions (Details) - Customer Contracts $ in Millions	6 Months Ended
	Jun. 30, 2015	Mar. 03, 2015 USD ($) contract
Finite-Lived Intangible Assets [Line Items]
Residential and commercial natural gas contracts		25,800
Contract purchase price | $		$ 2.0
Amortization period	3 years

X

- Definition

Intangible Asset, Purchase Consideration

+ References

No definition available.

+ Details

Name:	spke_IntangibleAssetPurchaseConsideration
Namespace Prefix:	spke_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Purchase Agreement, Natural Gas Contracts

+ References

No definition available.

+ Details

Name:	spke_PurchaseAgreementNaturalGasContracts
Namespace Prefix:	spke_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: