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Equity in Nonconsolidated Investments - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 21, 2016
Bcf / d
Mar. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Bcf / d
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Schedule of Equity Method Investments [Line Items]          
Issuance of performance guarantee     $ 91,000    
Investment balance     $ 135,949   $ 77,025
MVP Joint Venture          
Schedule of Equity Method Investments [Line Items]          
Duration of firm capacity commitments     20 years    
Firms capacity commitments per day (in bcf per day) | Bcf / d     2.0    
Variable Interest Entity, Not Primary Beneficiary | MVP Joint Venture          
Schedule of Equity Method Investments [Line Items]          
Maximum financial statement exposure     $ 227,000    
Investment balance     $ 135,949   $ 77,025
Variable Interest Entity, Not Primary Beneficiary | MVP Joint Venture | Mountain Valley Pipeline          
Schedule of Equity Method Investments [Line Items]          
Percentage of remaining obligations     33.00%    
EQM          
Schedule of Equity Method Investments [Line Items]          
Total investments     $ 3,400 $ 600  
EQM | Variable Interest Entity, Not Primary Beneficiary | MVP Joint Venture          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage     45.50%    
ConEd | Variable Interest Entity, Not Primary Beneficiary | MVP Joint Venture          
Schedule of Equity Method Investments [Line Items]          
Ownership interest (as a percent) 12.50%        
Duration of firm capacity commitments 20 years        
Firms capacity commitments per day (in bcf per day) | Bcf / d 0.25        
Decrease in ownership interest (as a percent) 8.50%        
Total consideration in cash   $ 12,500