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Formation and Organization - Other Transactions in Connection with the Consummation of the IPO (Details) |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 01, 2014 USD ($) shares | Sep. 30, 2016 | Dec. 31, 2016 USD ($) | May 29, 2014
Class of Stock [Line Items] |  |  |  |
Percent of stock offered | 21.82% |  |  |
Common Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Percent of stock offered | 21.82% |  |  |
Common stock voting rights ratio |  |  | 1 |
Common Class B |  |  |  |
Class of Stock [Line Items] |  |  |  |
Percent of stock offered | 78.18% |  |  |
Common stock voting rights ratio |  | 1 | 1 |
Spark Energy, Inc |  |  |  |
Class of Stock [Line Items] |  |  |  |
Line of credit facility, outstanding | $ | $ 10,000,000 |  |  |
Repayments of debt | $ | $ 10,000,000 |  |  |
NuDevco Retail Holdings | Common Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares to be issued | shares | 2,778 |  |  |
NuDevco Retail Holdings | Common Class B |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares to be issued | shares | 10,612,500 |  |  |
NuDevco Retail |  |  |  |
Class of Stock [Line Items] |  |  |  |
Ownership percentage transferred to affiliate | 1.00% |  |  |
NuDevco Retail | Common Class B |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares to be issued | shares | 137,500 |  |  |
Spark HoldCo | Common Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock, shares to be issued | shares | 2,997,222 |  |  |
Affiliated Entity |  |  |  |
Class of Stock [Line Items] |  |  |  |
Line of credit facility, outstanding | $ | $ 29,000,000 |  |  |
Spark Energy, Inc | Spark HoldCo |  |  |  |
Class of Stock [Line Items] |  |  |  |
Percent of stock offered | 21.82% |  |  |
NuDevco Retail | Spark HoldCo |  |  |  |
Class of Stock [Line Items] |  |  |  |
Percent of stock offered | 1.00% |  |  | 1.00%
Spark HoldCo | NuDevco Retail Holdings |  |  |  |
Class of Stock [Line Items] |  |  |  |
Investment in affiliate transferred | $ | $ 50,000 |  | $ 50,000 |

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