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Equity - Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 08, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Mar. 31, 2016
Class of Stock [Line Items] |  |  |  |  |
Net income attributable to Spark Energy, Inc. stockholders |  |  | $ 2,269 | $ 2,269 | $ 4,173
Less: Accumulated dividend on Series A preferred stock |  |  | 183 |  | 0
Net income attributable to stockholders of Class A common stock |  |  | $ 2,086 |  | $ 4,173
Basic weighted average Class A common shares outstanding |  |  | 6,498,000 |  | 3,756,000
Basic EPS attributable to shareholders (in dollars per share) | [1] |  | $ 0.32 |  | $ 1.11
Effect of conversion of Class B common stock to shares of Class A common stock |  |  | $ 0 |  | $ 6,094
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 (1) |  |  | 0 |  | (413)
Diluted net income attributable to stockholders of Class A common stock |  |  | $ 2,086 |  | $ 9,854
Basic weighted average Class A common shares outstanding |  |  | 6,498,000 |  | 3,756,000
Effect of dilutive Class B common stock (in shares) |  |  | 0 |  | 10,113,000
Effect of dilutive convertible subordinated notes into shares of Class B common stock and shares of Class B common stock into shares of Class A common stock |  |  | 0 |  | 493,000
Effect of dilutive restricted stock units (in shares) |  |  | 136,000 |  | 158,000
Diluted weighted average shares outstanding |  |  | 6,634,000 |  | 14,520,000
Diluted EPS attributable to shareholders (in dollars per share) | [1] |  | $ 0.31 |  | $ 0.68
CenStar Note | Common Class B |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares from conversion (shares) |  | 134,731 |  |  |
Oasis | Common Class B |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of shares from conversion (shares) |  | 383,090 |  |  |
[1] | In accordance with GAAP, net income attributable to stockholders of Class A common stock is presented net of cumulative Series A Preferred Stock dividends of $183 as of March 31, 2017.

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