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Transactions with Affiliates (Details) - USD ($)
 3 Months Ended
Aug. 23, 2016
Aug. 01, 2016
Jan. 01, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Jul. 31, 2015
Jul. 08, 2015
Related Party Transaction [Line Items]                
Accounts receivable—affiliates       $ 2,013,000   $ 2,624,000    
Accounts payable—affiliates       3,217,000   3,775,000    
Net asset optimization revenues [1]       (194,000) $ 527,000      
Retail cost of revenues (less than) [2]       143,698,000 68,800,000      
General and administrative expense - affiliates [3]       24,377,000 17,380,000      
Proceeds from disgorgement of stockholders short-swing profits       $ 666,000 0      
Tax receivable agreement, net cash savings (as a percent)       15.00%        
Prepaid assets - affiliates (less than)           $ 0    
Common Class B                
Related Party Transaction [Line Items]                
Share price (in dollars per share) $ 20 $ 20            
Convertible Debt | CenStar | Censtar Convertible Debt                
Related Party Transaction [Line Items]                
Notes, issued amount               $ 2,100,000.0
Convertible Debt | Oasis | Oasis Power Holdings Convertible Debt                
Related Party Transaction [Line Items]                
Notes, issued amount             $ 5,000,000.0  
Retailco                
Related Party Transaction [Line Items]                
Proceeds from disgorgement of stockholders short-swing profits       $ 700,000        
NuDevco Retail Holdings and NuDevco Retail | Tax Receivable Agreement                
Related Party Transaction [Line Items]                
Initial TRA payment       1,400,000        
Affiliated Entity                
Related Party Transaction [Line Items]                
General and administrative expense - affiliates         5,000,000      
Affiliated Entity | Purchased Natural Gas From Affiliate                
Related Party Transaction [Line Items]                
Cost of revenues       0 1,300,000      
Affiliated Entity | Purchased Natural Gas Sold To Affiliate                
Related Party Transaction [Line Items]                
Net asset optimization revenues       0 100,000      
Affiliated Entity | Marlin Transportation Agreement                
Related Party Transaction [Line Items]                
Retail cost of revenues (less than)       0 100,000      
Affiliated Entity | Allocated Overhead Costs                
Related Party Transaction [Line Items]                
General and administrative expense - affiliates       7,400,000 4,400,000      
Affiliated Entity | Property and Equipment Capitalized                
Related Party Transaction [Line Items]                
Amount capitalized for application, development and implementation of various systems       600,000        
Affiliated Entity | Retailco                
Related Party Transaction [Line Items]                
Service contract term     1 year          
Service contract, renewal term     1 year          
Affiliated Entity | Retailco | Allocated Overhead Costs                
Related Party Transaction [Line Items]                
General and administrative expense - affiliates       7,300,000        
Affiliated Entity | Retailco | Property and Equipment Capitalized                
Related Party Transaction [Line Items]                
Amount capitalized for application, development and implementation of various systems       100,000        
NuDevco Retail and Retailco                
Related Party Transaction [Line Items]                
Payments of distributions to affiliates       $ 3,900,000 $ 3,500,000      
Tax receivable agreement, net cash savings (as a percent)       85.00%        
NuDevco Retail and Retailco | Payment of Income Taxes Incurred by the Company                
Related Party Transaction [Line Items]                
Payments of distributions to affiliates       $ 500,000        
Subsidiary of Common Parent | Retailco | Common Class B                
Related Party Transaction [Line Items]                
Number of shares issued for acquisition (shares)   699,742            
Value of shares issued for acquisition   $ 14,000,000            
Subsidiary of Common Parent | National Gas & Electric, LLC | Common Class B                
Related Party Transaction [Line Items]                
Number of shares issued for acquisition (shares) 2,000,000              
NuDevco Retail Holdings and NuDevco Retail                
Related Party Transaction [Line Items]                
Tax receivable agreement, deferral period       5 years        
Tax receivable agreement, coverage percentage       130.00%        
Tax receivable agreement, target dividend (in dollars per share)       $ 0.3625        
[1] Net asset optimization revenues (expenses) includes asset optimization revenues —affiliates of $0 and $113 for the three months ended March 31, 2017 and 2016, respectively, and asset optimization revenues—affiliates cost of revenues of $0 and $1,258 for the three months ended March 31, 2017 and 2016, respectively.
[2] Retail cost of revenues includes retail cost of revenues—affiliates of $0 and less than $100 for the three months ended March 31, 2017 and 2016, respectively.
[3] General and administrative includes general and administrative expense—affiliates of $7,300 and $4,400 for the three months ended March 31, 2017 and 2016, respectively.