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Customer Acquisitions (Details) - Customer Contracts $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 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 |

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- Definition Intangible Asset, Purchase Consideration + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Purchase Agreement, Natural Gas Contracts + References No definition available. + Details
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Namespace Prefix: | spke_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |