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Document and Entity Information Document - shares
 6 Months Ended
Jun. 30, 2015
Aug. 11, 2015
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2  
Trading Symbol SPKE  
Entity Registrant Name Spark Energy, Inc.  
Entity Central Index Key 0001606268  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Common Class A    
Class of Stock [Line Items]    
Entity Common Stock, Shares Outstanding   3,097,193
Common Class B    
Class of Stock [Line Items]    
Entity Common Stock, Shares Outstanding   10,750,000