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EQT Midstream Partners, LP (Details) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 28, 2016 USD ($) shares | Jul. 26, 2016 $ / shares | Mar. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) mi $ / shares shares | Jun. 30, 2016 USD ($) Bcf / d mi | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Subsidiary or equity method investee |  |  |  |  |  |  |
Net proceeds |  |  |  |  | $ 217,102,000 | $ 696,582,000 |
Increase to deferred tax liability |  |  |  | $ 15,000,000 |  |  |
Common Stock |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |
Increase (decrease) in ownership of EQT Midstream Partners LP |  |  |  | 24,900,000 |  |  |
Noncontrolling Interest |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |
Increase (decrease) in ownership of EQT Midstream Partners LP |  |  |  | $ (39,900,000) |  |  |
Mountain Valley Pipeline |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |
Natural gas interstate pipeline (in miles) | mi |  |  |  | 300 | 300 |  |
EQM |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |
Common units issued (in shares) | shares |  |  |  | 2,949,309 |  |  |
Average price per unit (in dollars per share) | $ / shares |  |  |  | $ 74.42 |  |  |
Net proceeds |  |  |  | $ 217,100,000 |  |  |
Commissions |  |  |  | 2,200,000 |  |  |
Underwriters discount and offering expenses |  |  |  | $ 200,000 |  |  |
EQM | Subsequent Event |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |
Cash distribution declared | $ 40,800,000 |  |  |  |  |  |
EQM | Subsequent Event | General Partner |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |
Cash distribution declared (in dollars per share) | $ / shares |  | $ 0.78 |  |  |  |  |
Common unit, outstanding (in shares) | shares | 80,581,758 |  |  |  |  |  |
Cash distribution declared | $ 1,600,000 |  |  |  |  |  |
Cash distribution declared related to IDRs | 22,200,000 |  |  |  |  |  |
EQM | Subsequent Event | Limited Partner |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |
Cash distribution declared | $ 17,000,000 |  |  |  |  |  |
EQM | Maximum |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |
Aggregate offering price |  |  |  |  |  |  | $ 750,000,000
MVP Joint Venture |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |
Total consideration |  |  | $ 54,200,000 |  |  |  |
Percentage of capital contributions |  |  | 100.00% |  |  |  |
Firms capacity commitments per day (in bcf per day) | Bcf / d |  |  |  |  | 2.0 |  |
Duration of firm capacity commitments |  |  |  |  | 20 years |  |
MVP Joint Venture | EQM | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |
Ownership percentage |  |  |  | 45.50% | 45.50% |  |
MVP Joint Venture | EQT |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |
Firms capacity commitments per day (in bcf per day) | Bcf / d |  |  |  |  | 1.29 |  |
MVP Holdco |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |
Percentage of membership interest |  |  | 100.00% |  |  |  |

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