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Financial Information by Business Segment - Schedule of Revenue from External Customers and Operating Income (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 12, 2017 segment | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2018 segment | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($)
Operating segments information |  |  |  |  |  |
Number of reportable segments | segment | 3 |  |  | 5 | 4 |
Revenues: |  |  |  |  |  |
Sales of natural gas, oil and NGLs |  | $ 1,158,418 |  |  | $ 3,613,395 |
(Loss) gain on derivatives not designated as hedges |  | (3,075) | $ 35,625 |  | 5,620 | $ 222,693
Total operating revenues |  | 1,158,870 | 659,413 |  | 3,647,124 | 2,242,324
Reconciliation of operating (loss) income to net (loss) income: |  |  |  |  |  |
Total operating income (loss) |  | 71,824 | 138,027 |  | (1,551,723) | 719,130
Other income |  | 21,755 | 6,526 |  | 43,092 | 15,880
Interest expense |  | 93,042 | 50,377 |  | 240,059 | 137,110
Income tax (benefit) expense |  | (62,911) | (11,281) |  | (503,505) | 119,093
Net income (loss) |  | 63,448 | 105,457 |  | (1,245,185) | 478,807
Transaction costs |  | 31,506 | 10,806 |  | 93,176 | 15,044
Sales of natural gas, oil and NGLs |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Sales of natural gas, oil and NGLs |  | 1,046,989 | 552,953 |  | 3,264,728 | 1,803,132
Pipeline, water and net marketing services |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Pipeline, water and net marketing services |  | 114,956 | 70,835 |  | 376,776 | 216,499
EQT Production |  |  |  |  |  |
Reconciliation of operating (loss) income to net (loss) income: |  |  |  |  |  |
Impairment of long-lived assets |  | 300,000 |  |  | 2,700,000 |
Operating Segments | EQT Production |  |  |  |  |  |
Revenues: |  |  |  |  |  |
(Loss) gain on derivatives not designated as hedges |  | (3,075) | 35,625 |  | 5,620 | 222,693
Total operating revenues |  | 1,050,046 | 597,718 |  | 3,312,730 | 2,057,481
Reconciliation of operating (loss) income to net (loss) income: |  |  |  |  |  |
Total operating income (loss) |  | (121,678) | 12,201 |  | (2,127,323) | 322,634
Operating Segments | EQT Production | Sales of natural gas, oil and NGLs |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Sales of natural gas, oil and NGLs |  | 1,046,989 | 552,953 |  | 3,264,728 | 1,803,132
Operating Segments | EQT Production | Pipeline, water and net marketing services |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Pipeline, water and net marketing services |  | 6,132 | 9,140 |  | 42,382 | 31,656
Operating Segments | EQM Gathering |  |  |  |  |  |
Revenues: |  |  |  |  |  |
(Loss) gain on derivatives not designated as hedges |  | 0 | 0 |  | 0 | 0
Total operating revenues |  | 252,861 | 116,522 |  | 731,440 | 330,996
Reconciliation of operating (loss) income to net (loss) income: |  |  |  |  |  |
Total operating income (loss) |  | 177,902 | 85,932 |  | 510,755 | 243,061
Operating Segments | EQM Gathering | Sales of natural gas, oil and NGLs |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Sales of natural gas, oil and NGLs |  | 0 | 0 |  | 0 | 0
Operating Segments | EQM Gathering | Pipeline, water and net marketing services |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Pipeline, water and net marketing services |  | 252,861 | 116,522 |  | 731,440 | 330,996
Operating Segments | EQM Transmission |  |  |  |  |  |
Revenues: |  |  |  |  |  |
(Loss) gain on derivatives not designated as hedges |  | 0 | 0 |  | 0 | 0
Total operating revenues |  | 89,350 | 89,771 |  | 285,429 | 272,184
Reconciliation of operating (loss) income to net (loss) income: |  |  |  |  |  |
Total operating income (loss) |  | 58,691 | 59,770 |  | 198,784 | 189,237
Operating Segments | EQM Transmission | Sales of natural gas, oil and NGLs |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Sales of natural gas, oil and NGLs |  | 0 | 0 |  | 0 | 0
Operating Segments | EQM Transmission | Pipeline, water and net marketing services |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Pipeline, water and net marketing services |  | 89,350 | 89,771 |  | 285,429 | 272,184
Operating Segments | EQM Water |  |  |  |  |  |
Revenues: |  |  |  |  |  |
(Loss) gain on derivatives not designated as hedges |  | 0 |  |  | 0 |
Total operating revenues |  | 22,373 |  |  | 93,438 |
Reconciliation of operating (loss) income to net (loss) income: |  |  |  |  |  |
Total operating income (loss) |  | (3,093) | 0 |  | 35,627 | 0
Operating Segments | EQM Water | Sales of natural gas, oil and NGLs |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Sales of natural gas, oil and NGLs |  | 0 |  |  | 0 |
Operating Segments | EQM Water | Pipeline, water and net marketing services |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Pipeline, water and net marketing services |  | 22,373 |  |  | 93,438 |
Intersegment Eliminations |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Sales of natural gas, oil and NGLs |  | (255,760) |  |  | (775,913) |
(Loss) gain on derivatives not designated as hedges |  | 0 | 0 |  | 0 | 0
Total operating revenues |  | (255,760) | (144,598) |  | (775,913) | (418,337)
Reconciliation of operating (loss) income to net (loss) income: |  |  |  |  |  |
Income (loss) included in development costs |  | 3,200 |  |  | 50,700 |
Intersegment Eliminations | Sales of natural gas, oil and NGLs |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Sales of natural gas, oil and NGLs |  | 0 | 0 |  | 0 | 0
Intersegment Eliminations | Pipeline, water and net marketing services |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Pipeline, water and net marketing services |  | (255,760) | (144,598) |  | (775,913) | (418,337)
Unallocated Expenses and Intersegment Eliminations |  |  |  |  |  |
Reconciliation of operating (loss) income to net (loss) income: |  |  |  |  |  |
Total operating income (loss) |  | (39,998) | $ (19,876) |  | (169,566) | $ (35,802)
Corporate, Non-Segment |  |  |  |  |  |
Reconciliation of operating (loss) income to net (loss) income: |  |  |  |  |  |
Transaction costs |  | 29,300 |  |  | 85,700 |
Amortization |  | $ 10,400 |  |  | $ 31,000 |

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