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Fair Value Measurements (Details) - USD ($)
 1 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Aug. 23, 2016
Apr. 15, 2016
Aug. 31, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Aug. 01, 2016
Mar. 31, 2016
Jul. 08, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Contingent consideration - earnout obligations incurred in connection with the Provider Companies and Major Energy Companies acquisitions           $ 18,936,000 [1] $ 0 [2] $ 0      
Current contingent consideration for acquisitions [3]       $ 11,827,000 $ 11,827,000 11,827,000 500,000        
Contingent consideration for acquisitions [3]       10,826,000 10,826,000 10,826,000 0        
Change in fair value of earnout liabilities           (297,000) [1] 0 [2] 0      
Accretion on fair value of Major Earnout and Provider Earnout liabilities           5,059,000 [1] 0 [2] 0      
Recurring                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Total commodity derivative assets       11,427,000 11,427,000 11,427,000 605,000        
Total commodity derivative liabilities       (748,000) (748,000) (748,000) (11,238,000)        
Contingent payment arrangement       (22,652,000) (22,652,000) (22,652,000) (500,000)        
Recurring | Level 1                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Total commodity derivative assets       1,612,000 1,612,000 1,612,000 0        
Total commodity derivative liabilities       0 0 0 (3,324,000)        
Contingent payment arrangement       0 0 0 0        
Recurring | Level 2                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Total commodity derivative assets       9,815,000 9,815,000 9,815,000 605,000        
Total commodity derivative liabilities       (748,000) (748,000) (748,000) (7,914,000)        
Contingent payment arrangement       0 0 0 0        
Recurring | Level 3                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Total commodity derivative assets       0 0 0 0        
Total commodity derivative liabilities       0 0 0 0        
Contingent payment arrangement       (22,652,000) (22,652,000) (22,652,000) (500,000) $ 0      
Change in fair value of earnout liabilities           (297,000)          
Accretion on fair value of Major Earnout and Provider Earnout liabilities           5,059,000          
Recurring | Non-trading commodity contract                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Total commodity derivative assets       10,896,000 10,896,000 10,896,000 200,000        
Total commodity derivative liabilities       (661,000) (661,000) (661,000) (10,985,000)        
Recurring | Non-trading commodity contract | Level 1                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Total commodity derivative assets       1,511,000 1,511,000 1,511,000 0        
Total commodity derivative liabilities       0 0 0 (3,324,000)        
Recurring | Non-trading commodity contract | Level 2                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Total commodity derivative assets       9,385,000 9,385,000 9,385,000 200,000        
Total commodity derivative liabilities       (661,000) (661,000) (661,000) (7,661,000)        
Recurring | Non-trading commodity contract | Level 3                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Total commodity derivative assets       0 0 0 0        
Total commodity derivative liabilities       0 0 0 0        
Recurring | Trading commodity contract                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Total commodity derivative assets       531,000 531,000 531,000 405,000        
Total commodity derivative liabilities       (87,000) (87,000) (87,000) (253,000)        
Recurring | Trading commodity contract | Level 1                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Total commodity derivative assets       101,000 101,000 101,000 0        
Total commodity derivative liabilities       0 0 0 0        
Recurring | Trading commodity contract | Level 2                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Total commodity derivative assets       430,000 430,000 430,000 405,000        
Total commodity derivative liabilities       (87,000) (87,000) (87,000) (253,000)        
Recurring | Trading commodity contract | Level 3                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Total commodity derivative assets       0 0 0 0        
Total commodity derivative liabilities       0 0 $ 0 0        
Provider Companies                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Business Combination, Contingent Consideration, Earnout Period           9 months          
Earnout maximum                 $ 9,000,000    
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low       5,000,000 5,000,000 $ 5,000,000          
Provider Companies | Recurring                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Contingent consideration - earnout obligations incurred in connection with the Provider Companies and Major Energy Companies acquisitions           4,800,000          
Major Energy Purchase Agreement | Recurring                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Contingent payment arrangement       (17,100,000) (17,100,000) (17,100,000)          
CenStar                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Contingent payment arrangement             (500,000)     $ (1,500,000) $ (500,000)
Current contingent consideration for acquisitions       11,800,000 11,800,000 11,800,000          
Contingent consideration for acquisitions       8,400,000 8,400,000 8,400,000          
Payment for Contingent Consideration Liability, Investing Activities     $ (1,300,000)                
Decrease in Restricted Cash     $ 600,000                
CenStar | Recurring                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Contingent payment arrangement       (700,000) (700,000) (700,000)          
General and Administrative Expense | CenStar                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Change in fair value of earnout liabilities           (200,000)          
National Gas & Electric, LLC | Major Energy Companies                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Business Combination, Contingent Consideration, Earnout Period   33 months                  
Earnout maximum   $ 20,000,000.0   17,800,000.0 17,800,000.0 17,800,000.0          
Decrease in fair value recorded in general and administrative expense           1,100,000          
Major Energy Companies | Common Class B                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Share amount maximum (in shares) 40,718                    
Major Energy Companies | Maximum | Common Class B                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Share amount maximum (in shares) 200,000                    
Provider Earnout                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Accretion on fair value of Major Earnout and Provider Earnout liabilities       100,000   100,000          
Provider Earnout | Recurring | Level 3                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Contingent payment arrangement       $ (4,892,000) (4,892,000) (4,892,000) 0        
Change in fair value of earnout liabilities           0          
Accretion on fair value of Major Earnout and Provider Earnout liabilities           $ 69,000          
Major Earnout                      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                      
Accretion on fair value of Major Earnout and Provider Earnout liabilities         $ 5,000,000   $ 4,900,000        
[1] Financial information has been recast to include results attributable to the acquisition of the Major Energy Companies from an affiliate on August 23, 2016. See Notes 2 and 3 "Basis of Presentation and Summary of Significant Accounting Policies" and "Acquisitions," respectively, for further discussion.
[2] Financial information has been recast to include results attributable to the acquisition of Oasis Power Holdings LLC by an affiliate on May 12, 2015. See Notes 2 "Basis of Presentation and Summary of Significant Accounting Policies" for further discussion.
[3] See Note 4 "Equity" for disclosure of our variable interest entity in Spark HoldCo, LLC.