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Long-Term Debt (Details) - USD ($)
 3 Months Ended 6 Months Ended
Aug. 01, 2014
Jul. 31, 2013
Dec. 17, 2012
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Jan. 24, 2011
May. 30, 2008
Line of Credit Facility [Line Items]                      
Letters of credit issued and outstanding       $ 10,800,000   $ 10,800,000          
Deferred financing costs       200,000   200,000   $ 300,000      
Amortization of deferred financing costs       100,000 $ 100,000 100,000 $ 200,000        
Interest expense       207,000 222,000 588,000 535,000        
NuDevco Retail Holdings | Spark HoldCo | Notes Payable                      
Line of Credit Facility [Line Items]                      
Note payable $ 50,000                    
Other Current Assets                      
Line of Credit Facility [Line Items]                      
Deferred financing costs       200,000   200,000   200,000      
Other Noncurrent Assets                      
Line of Credit Facility [Line Items]                      
Deferred financing costs               $ 100,000      
Working Capital Facility                      
Line of Credit Facility [Line Items]                      
Line of credit facility, maximum borrowing capacity   $ 80,000,000 $ 70,000,000             $ 150,000,000 $ 177,500,000.0
Working capital facility outstanding                 $ 27,500,000    
Working capital credit facility outstanding portion paid by affiliate 29,000,000                    
Letters of credit issued and outstanding 15,000,000                    
Fees on letters of credit issued and outstanding       100,000 100,000 100,000 200,000        
Nonutilization fee     0.50%                
Interest expense       100,000 100,000 $ 300,000 100,000        
Commitment fee percentage           0.50%          
Commitment fee amount, less than       100,000 100,000 $ 100,000 100,000        
Working Capital Facility | Eurodollar | Minimum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   3.00% 3.00%                
Working Capital Facility | Eurodollar | Maximum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   3.25% 3.75%                
Working Capital Facility | Base Rate | Minimum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   2.00% 2.00%                
Working Capital Facility | Base Rate | Maximum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   2.25% 2.75%                
Working Capital Facility | Cost of Funds Rate | Minimum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   2.50%                  
Working Capital Facility | Cost of Funds Rate | Maximum                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate   2.75%                  
Term Loan                      
Line of Credit Facility [Line Items]                      
Line of credit facility, maximum borrowing capacity     $ 125,000,000             $ 130,000,000 100,000,000
Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Line of credit facility, maximum borrowing capacity     $ 30,000,000               $ 35,000,000
Revolving Credit Facility | Senior Secured Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Commitment fee amount, less than       100,000 $ 100,000 100,000 $ 100,000        
Line of credit facility, outstanding 10,000,000                    
Revolving Credit Facility | Senior Secured Revolving Credit Facility | Line of Credit                      
Line of Credit Facility [Line Items]                      
Line of credit facility, maximum borrowing capacity 70,000,000.0                    
Working capital facility outstanding       $ 9,000,000   $ 9,000,000          
Contingent maximum borrowing capacity $ 120,000,000.0                    
Reduction to interest rate if facility utilization is less than fifty percent 0.25%                    
Revolving Credit Facility | Minimum | Senior Secured Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Commitment fee percentage 0.375%                    
Used capacity fee percentage 2.00%                    
Revolving Credit Facility | Maximum | Senior Secured Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Commitment fee percentage 0.50%                    
Used capacity fee percentage 2.50%                    
Revolving Credit Facility | Eurodollar | Minimum | Senior Secured Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate 2.75%                    
Revolving Credit Facility | Eurodollar | Maximum | Senior Secured Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate 3.00%                    
Revolving Credit Facility | Base Rate | Minimum | Senior Secured Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate 1.75%                    
Revolving Credit Facility | Base Rate | Maximum | Senior Secured Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate 2.00%                    
Revolving Credit Facility | Cost of Funds Rate | Minimum | Senior Secured Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate 2.25%                    
Revolving Credit Facility | Cost of Funds Rate | Maximum | Senior Secured Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate 2.50%                    
Revolving Credit Facility | Base Rate Plus Margin | Senior Secured Revolving Credit Facility                      
Line of Credit Facility [Line Items]                      
Stated percentage interest rate 2.00%                    
Letters Of Credit Outstanding More Than Two Business Days | Base Rate                      
Line of Credit Facility [Line Items]                      
Basis spread on variable rate           2.00%