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Formation and Organization - Initial Public Offering of Spark Energy, Inc. (Details) - USD ($) |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Aug. 23, 2016 | Aug. 01, 2016 | Jul. 31, 2015 | Jul. 08, 2015 | May 29, 2014 | Apr. 22, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percent of stock offered | 21.82% |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the offering | $ 47,600,000 |  |  |  |  |  |  |  |  |  |  |
Payment of note payable to NuDevco |  | $ 0 | [1] | $ 0 | [2] | $ 50,000 |  |  |  |  |  |
Offering costs | $ 2,700,000 | $ 0 | [1] | $ 0 | [2] | $ 2,667,000 |  |  |  |  |  |
Spark Energy, Inc | NuDevco Retail Holdings |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percent of stock offered | 21.82% |  |  |  |  |  |  |  |  |  |  |
Payment of note payable to NuDevco | $ 50,000 |  |  |  |  |  |  |  |  |  |  |
Common Class A |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares | 3,000,000 |  |  |  |  |  |  |  |  |  |  |
Percent of stock offered | 21.82% |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.01 |  | $ 0.01 |  |  |  |  |  |  |  | $ 0.01
Common Class A | Spark Energy, Inc | NuDevco Retail Holdings |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percent of stock offered | 21.82% |  |  |  |  |  |  |  |  |  |  |
Common Class B |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares | 10,750,000 |  |  |  |  |  |  |  |  |  |  |
Common stock, price per share (in dollars per share) |  |  |  |  |  |  | $ 20 | $ 20 |  |  |  |
Percent of stock offered | 78.18% |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |  | $ 0.01 |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 |
Common Class B | NuDevco Retail Holdings |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares | 10,612,500 |  |  |  |  |  |  |  |  |  |  |
Common Class B | NuDevco Retail |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares | 137,500 |  |  |  |  |  |  |  |  |  |  |
IPO | Common Class A |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares | 3,000,000 |  |  |  |  |  |  |  |  |  |  |
Common stock, price per share (in dollars per share) | $ 18.00 |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |  |  |  |  |  |
[1] | Financial information has been recast to include results attributable to the acquisition of the Major Energy Companies from an affiliate on August 23, 2016. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions," respectively, for further discussion.
[2] | Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC by an affiliate on May 12, 2015. See Notes 2 "Basis of Presentation and Summary of Significant Accounting Policies" for further discussion.

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