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EQT Midstream Partners, LP (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 21, 2015 USD ($) $ / shares | May. 15, 2015 | Mar. 30, 2015 USD ($) mi | Mar. 17, 2015 USD ($) shares | Mar. 11, 2015 USD ($) | Feb. 17, 2015 | Jun. 30, 2015 USD ($) shares | Jun. 30, 2014 USD ($) | Apr. 15, 2015 USD ($) | Dec. 31, 2012 shares
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Proceeds from offerings, net of underwriters' discounts and structuring fees |  |  |  |  |  |  | $ 696,582 | $ 902,451 |  |
Ownership interest |  |  |  |  |  |  | 30.20% |  |  |
Changes in ownership of consolidate subsidiary |  |  |  |  |  |  | $ (72,954) |  |  |
Increase to deferred tax liability |  |  |  |  |  |  | 73,000 |  |  |
MVP Interest In Joint Venture |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Consideration |  |  | $ 54,200 |  |  |  |  |  |  |
Ownership interest |  |  | 100.00% |  |  |  |  |  |  |
EQT Energy Supply, LLC |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  | $ 124,300 |
EQM |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Number of subordinated units | shares |  |  |  |  |  |  |  |  |  | 17,339,718
Conversion ratio |  |  |  |  |  | 1 |  |  |  |
Number of common units issued to the public in an offering | shares |  |  |  | 8,250,000 |  |  |  |  |  |
Proceeds from offerings, net of underwriters' discounts and structuring fees |  |  |  | $ 696,600 |  |  |  |  |  |
Offering expenses |  |  |  | 24,500 |  |  |  |  |  |
EQM | NWV Gathering |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Consideration |  |  |  | 925,700 |  |  |  |  |  |
Cash consideration |  |  |  | $ 873,200 |  |  |  |  |  |
EQM | MVP Holdco |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  | 100.00% |  |  |  |  |  |  |
EQM | Mountain Valley Pipeline |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  | 55.00% |  |  |  |  |  |  |
EQM | MVP Interest In Joint Venture |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Capital contribution reimbursement |  |  |  |  | $ 8,300 |  |  |  |  |
EQM | WGL Holdings, Inc. |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 7.00% |  |  |  |  |
EQM | Vega Energy Partners, Ltd. |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  | 3.00% |  |  |  |  |
EQM | Common Partner Units | Partnership Interest | NWV Gathering |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Number of common units representing limited partner interest | shares |  |  |  | 511,973 |  |  |  |  |  |
EQM | General Partner Units | Partnership Interest | NWV Gathering |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Number of common units representing limited partner interest | shares |  |  |  | 178,816 |  |  |  |  |  |
Mountain Valley Pipeline |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Length of natural gas interstate pipeline (in miles) | mi |  |  | 300 |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Changes in ownership of consolidate subsidiary |  |  |  | $ 122,800 |  |  | 122,833 |  |  |
Noncontrolling Interests in Consolidated Subsidiaries |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Changes in ownership of consolidate subsidiary |  |  |  | $ 195,800 |  |  | $ (195,787) |  |  |
Limited Partner Common |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Number of common units issued to the public in an offering | shares |  |  |  | 1,237,500 |  |  |  |  |  |
Number of common units | shares |  |  |  |  |  |  | 21,811,643 |  |  |
Ownership interest |  | 90.10% |  |  |  |  |  |  |  |
General Partner |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Number of general partner units | shares |  |  |  |  |  |  | 1,443,015 |  |  |
General partner's interest |  |  |  |  |  |  | 2.00% |  |  |
General Partner | EQM | Subsequent Event |  |  |  |  |  |  |  |  |  |
Subsidiary or equity method investee |  |  |  |  |  |  |  |  |  |
Cash distribution declared (in dollars per share) | $ / shares | $ 0.64 |  |  |  |  |  |  |  |  |
Cash distribution declared | $ 1,100 |  |  |  |  |  |  |  |  |
Cash distribution declared related to IDRs | $ 10,100 |  |  |  |  |  |  |  |  |

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