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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.