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Formation and Organization (Details)
$ / shares in Units, customer in Thousands
 9 Months Ended
Aug. 01, 2014
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
vote
state
customer
$ / shares
Sep. 30, 2014
USD ($)
Jul. 31, 2015
state
$ / shares
Jul. 08, 2015
$ / shares
May. 04, 2015
Dec. 31, 2014
$ / shares
Class of Stock [Line Items]              
Percent of stock offered 21.82%            
Net proceeds from the offering | $ $ 47,600,000 $ 0 [1] $ (47,554,000)        
Payment of note payable to NuDevco | $   0 [1] 50,000        
Offering costs | $ $ 2,700,000 $ 0 [1] $ 2,667,000        
Conversion of stock exchange ratio   1          
Oasis Power Holdings              
Class of Stock [Line Items]              
Number of customers | customer   43          
Number of states in which company operates | state   6   6      
CenStar              
Class of Stock [Line Items]              
Number of customers | customer   16          
Number of states in which company operates | state   3          
Common Class A              
Class of Stock [Line Items]              
Common stock, shares 3,000,000            
Common stock, par value | $ / shares   $ 0.01         $ 0.01
Percent of stock offered 21.82%            
Common stock voting rights | vote   1          
Common Class B              
Class of Stock [Line Items]              
Common stock, shares 10,750,000            
Common stock, par value | $ / shares $ 0.01 $ 0.01   $ 0.01 $ 0.01   $ 0.01
Percent of stock offered 78.18%            
Common stock voting rights | vote   1          
Common Stock              
Class of Stock [Line Items]              
Common stock, shares 13,750,000            
Percent of stock offered 100.00%            
IPO | Common Class A              
Class of Stock [Line Items]              
Common stock, shares 3,000,000            
Common stock, par value | $ / shares $ 0.01            
Common stock, price per share (usd per share) | $ / shares $ 18.00            
Spark HoldCo              
Class of Stock [Line Items]              
Noncontrolling interest ownership percentage   22.37%       21.82%  
NuDevco Retail | Common Class B              
Class of Stock [Line Items]              
Common stock, shares 137,500            
NuDevco Retail Holdings | Common Class B              
Class of Stock [Line Items]              
Common stock, shares 10,612,500            
NuDevco Retail | Spark HoldCo              
Class of Stock [Line Items]              
Noncontrolling interest ownership percentage   1.00%          
NuDevco Retail Holdings | Spark Energy, Inc              
Class of Stock [Line Items]              
Percent of stock offered 21.82%            
Payment of note payable to NuDevco | $ $ 50,000            
NuDevco Retail Holdings | Spark Energy, Inc | Common Class A              
Class of Stock [Line Items]              
Percent of stock offered 21.82%            
[1] Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC on May 12, 2015 from an affiliate. See Note 2 “Basis of Presentation” and Note 3 "Acquisitions" for further discussion.