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Formation and Organization (Details) - USD ($) | Aug. 01, 2014 | Jun. 30, 2015 | May. 04, 2015 | Dec. 31, 2014 | Dec. 17, 2012 | May. 30, 2008
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Class of Stock [Line Items] |  |  |  |  |  |
Percent of stock offered | 21.82% |  |  |  |  |
Net proceeds from the offering | $ 47,600,000 |  |  |  |  |
Offering costs | 2,700,000 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 30,000,000 | $ 35,000,000
Line of Credit | Revolving Credit Facility | Senior Secured Revolving Credit Facility |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 70,000,000.0 |  |  |  |  |
Common Class A |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares | 3,000,000 |  |  |  |  |
Common stock, par value |  | $ 0.01 |  | $ 0.01 |  |
Percent of stock offered | 21.82% |  |  |  |  |
Common Class B |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares | 10,750,000 |  |  |  |  |
Common stock, par value | $ 0.01 | $ 0.01 |  | $ 0.01 |  |
Percent of stock offered | 78.18% |  |  |  |  |
Common Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares | 13,750,000 |  |  |  |  |
Percent of stock offered | 100.00% |  |  |  |  |
IPO | Common Class A |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares | 3,000,000 |  |  |  |  |
Common stock, par value | $ 0.01 |  |  |  |  |
Common stock, price per share (usd per share) | $ 18.00 |  |  |  |  |
Spark HoldCo |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Noncontrolling interest ownership percentage |  | 22.37% | 21.82% |  |  |
NuDevco Retail | Common Class B |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares | 137,500 |  |  |  |  |
NuDevco Retail Holdings | Common Class B |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares | 10,612,500 |  |  |  |  |
NuDevco Retail | Spark HoldCo |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Noncontrolling interest ownership percentage |  | 1.00% |  |  |  |
NuDevco Retail Holdings | Spark Energy, Inc |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Percent of stock offered | 21.82% |  |  |  |  |
Payment of note payable to NuDevco | $ 50,000 |  |  |  |  |
NuDevco Retail Holdings | Spark Energy, Inc | Common Class A |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Percent of stock offered | 21.82% |  |  |  |  |

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