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Equity - Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 7 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Net income attributable to stockholders of Class A common stock | $ (21) | $ 14,444 | [1] | $ 3,865 | [2] | $ (54)
Basic weighted average Class A common shares outstanding (in shares) |  | 5,701 | [1] | 3,064 | [2] | 3,000
Basic EPS attributable to Spark Energy, Inc. stockholders (in dollars per share) |  | $ 2.53 | [1] | $ 1.26 | [2] | $ (0.02)
Effect of conversion of Class B common stock to shares of Class A common stock |  | $ 0 |  | $ 0 |  |
Effect of conversion of convertible subordinated notes into shares of Class B common stock and shares of Class B common stock into shares of Class A common stock |  | (310) |  | (334) |  |
Diluted net income attributable to stockholders of Class A common stock |  | $ 14,134 |  | $ 3,531 |  |
Basic weighted average Class A common shares outstanding (in shares) |  | 5,701 | [1] | 3,064 | [2] | 3,000
Effect of conversion of convertible subordinated notes into shares of Class B common stock and shares of Class B common stock into shares of Class A common stock (in shares) |  | 505 |  | 210 |  |
Effect of dilutive restricted stock units (in shares) |  | 139 |  | 53 |  |
Diluted weighted average shares outstanding (in shares) |  | 6,345 | [1] | 3,327 | [2] | 3,000
Diluted EPS attributable to Spark Energy, Inc. stockholders (in dollars per share) |  | $ 2.23 | [1] | $ 1.06 | [2] | $ (0.02)
Common Class A |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Basic weighted average Class A common shares outstanding (in shares) |  | 5,701 |  | 3,064 |  |
Basic weighted average Class A common shares outstanding (in shares) |  | 5,701 |  | 3,064 |  |
Common Class B |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |
Effect of dilutive Class B common stock (in shares) |  | 0 |  | 0 |  |
[1] | Financial information has been recast to include results attributable to the acquisition of Major Energy Companies by an affiliate on April 15, 2016. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions," respectively, for further discussion.
[2] | (2) Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC from an affiliate on May 12, 2015. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions", respectively, for further discussion.

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