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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.