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Equity in Nonconsolidated Investments - Schedule of Equity in Nonconsolidated Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]    
Investment in nonconsolidated entity $ 135,949 $ 77,025
Variable Interest Entity, Not Primary Beneficiary | MVP Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Investment in nonconsolidated entity $ 135,949 $ 77,025
EQM | Variable Interest Entity, Not Primary Beneficiary | MVP Joint Venture    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 45.50%