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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 |  |  |

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