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Formation and Organization - Other Transactions in Connection with the Consummation of the IPO (Details)
 9 Months Ended 12 Months Ended
Aug. 01, 2014
USD ($)
shares
Sep. 30, 2016
Dec. 31, 2016
USD ($)
May 29, 2014
Class of Stock [Line Items]        
Percent of stock offered 21.82%      
Common Class A        
Class of Stock [Line Items]        
Percent of stock offered 21.82%      
Common stock voting rights ratio     1  
Common Class B        
Class of Stock [Line Items]        
Percent of stock offered 78.18%      
Common stock voting rights ratio   1 1  
Spark Energy, Inc        
Class of Stock [Line Items]        
Line of credit facility, outstanding | $ $ 10,000,000      
Repayments of debt | $ $ 10,000,000      
NuDevco Retail Holdings | Common Class A        
Class of Stock [Line Items]        
Common stock, shares to be issued | shares 2,778      
NuDevco Retail Holdings | Common Class B        
Class of Stock [Line Items]        
Common stock, shares to be issued | shares 10,612,500      
NuDevco Retail        
Class of Stock [Line Items]        
Ownership percentage transferred to affiliate 1.00%      
NuDevco Retail | Common Class B        
Class of Stock [Line Items]        
Common stock, shares to be issued | shares 137,500      
Spark HoldCo | Common Class A        
Class of Stock [Line Items]        
Common stock, shares to be issued | shares 2,997,222      
Affiliated Entity        
Class of Stock [Line Items]        
Line of credit facility, outstanding | $ $ 29,000,000      
Spark Energy, Inc | Spark HoldCo        
Class of Stock [Line Items]        
Percent of stock offered 21.82%      
NuDevco Retail | Spark HoldCo        
Class of Stock [Line Items]        
Percent of stock offered 1.00%     1.00%
Spark HoldCo | NuDevco Retail Holdings        
Class of Stock [Line Items]        
Investment in affiliate transferred | $ $ 50,000   $ 50,000