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Segment Reporting - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting [Abstract] |  |
Asset optimization revenue | $ 61.9 | $ 42.3
Asset optimization cost of revenues | $ 62.1 | $ 41.8

X
- Definition Asset Optimization, Cost of Revenues + References No definition available. + Details
Name: | spke_AssetOptimizationCostofRevenues
Namespace Prefix: | spke_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Asset Optimization Revenue, Gross + References No definition available. + Details
Name: | spke_AssetOptimizationRevenueGross
Namespace Prefix: | spke_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration