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Formation and Organization (Details) - USD ($)
Aug. 01, 2014
Jun. 30, 2015
May. 04, 2015
Dec. 31, 2014
Dec. 17, 2012
May. 30, 2008
Class of Stock [Line Items]            
Percent of stock offered 21.82%          
Net proceeds from the offering $ 47,600,000          
Offering costs 2,700,000          
Revolving Credit Facility            
Class of Stock [Line Items]            
Line of credit facility, maximum borrowing capacity         $ 30,000,000 $ 35,000,000
Line of Credit | Revolving Credit Facility | Senior Secured Revolving Credit Facility            
Class of Stock [Line Items]            
Line of credit facility, maximum borrowing capacity $ 70,000,000.0          
Common Class A            
Class of Stock [Line Items]            
Common stock, shares 3,000,000          
Common stock, par value   $ 0.01   $ 0.01    
Percent of stock offered 21.82%          
Common Class B            
Class of Stock [Line Items]            
Common stock, shares 10,750,000          
Common stock, par value $ 0.01 $ 0.01   $ 0.01    
Percent of stock offered 78.18%          
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 $ 0.01          
Common stock, price per share (usd per share) $ 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%