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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract with customer, asset, net | $ 488,700 |  | $ 488,700 |  |
Revenues from contracts with customers | 1,158,418 |  | 3,613,395 |  |
(Loss) gain on derivatives not designated as hedges | (3,075) | $ 35,625 | 5,620 | $ 222,693 |
Other sources of revenue | 452 |  | 33,729 |  |
Total operating revenues | 1,158,870 | 659,413 | $ 3,647,124 | 2,242,324 |
Gathering, Transmission, and Storage Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Number of days in which payment is required |  |  | 21 days |  |
Natural Gas Sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 931,976 |  | $ 2,877,660 |  |
Other sources of revenue, excluding gain (loss) on derivatives | 0 |  | 0 |  |
Total, excluding gain (loss) on derivatives | 931,976 |  | 2,877,660 |  |
NGLs Sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 106,621 |  | 357,746 |  |
Other sources of revenue, excluding gain (loss) on derivatives | 0 |  | 0 |  |
Total, excluding gain (loss) on derivatives | 106,621 |  | 357,746 |  |
Oil Sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 8,392 |  | 29,322 |  |
Other sources of revenue, excluding gain (loss) on derivatives | 0 |  | 0 |  |
Total, excluding gain (loss) on derivatives | 8,392 |  | $ 29,322 |  |
Natural Gas, Oil, and NGLs Sales |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Number of days in which payment is required |  |  | 25 days |  |
Revenues from contracts with customers | 1,046,989 |  | $ 3,264,728 |  |
Other sources of revenue, excluding gain (loss) on derivatives | 0 |  | 0 |  |
Total, excluding gain (loss) on derivatives | 1,046,989 |  | $ 3,264,728 |  |
Water Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Number of days in which payment is required |  |  | 21 days |  |
Pipeline, Water and Net Marketing Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 111,429 |  | $ 348,667 |  |
Other sources of revenue, excluding gain (loss) on derivatives | 3,527 |  | 28,109 |  |
Total, excluding gain (loss) on derivatives | 114,956 |  | 376,776 |  |
Intersegment Eliminations |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | (255,760) |  | (775,913) |  |
Other sources of revenue, excluding gain (loss) on derivatives | 0 |  | 0 |  |
Total, excluding gain (loss) on derivatives | (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) |
EQT Production | Pipeline and Net Marketing Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 2,605 |  | 14,273 |  |
Other sources of revenue, excluding gain (loss) on derivatives | 3,527 |  | 28,109 |  |
Total, excluding gain (loss) on derivatives | 6,132 |  | 42,382 |  |
EQM Gathering | Firm Reservation Fee Revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 112,598 |  | 334,233 |  |
Other sources of revenue, excluding gain (loss) on derivatives | 0 |  | 0 |  |
Total, excluding gain (loss) on derivatives | 112,598 |  | 334,233 |  |
EQM Gathering | Usage Fees Under Firm Contracts |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 8,661 |  | 30,725 |  |
Other sources of revenue, excluding gain (loss) on derivatives | 0 |  | 0 |  |
Total, excluding gain (loss) on derivatives | 8,661 |  | 30,725 |  |
EQM Gathering | Usage Fees Under Interruptible Contract |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 131,602 |  | 366,482 |  |
Other sources of revenue, excluding gain (loss) on derivatives | 0 |  | 0 |  |
Total, excluding gain (loss) on derivatives | 131,602 |  | 366,482 |  |
EQM Transmission | Firm Reservation Fee Revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 82,669 |  | 262,666 |  |
Other sources of revenue, excluding gain (loss) on derivatives | 0 |  | 0 |  |
Total, excluding gain (loss) on derivatives | 82,669 |  | 262,666 |  |
EQM Transmission | Usage Fees Under Firm Contracts |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 5,331 |  | 13,981 |  |
Other sources of revenue, excluding gain (loss) on derivatives | 0 |  | 0 |  |
Total, excluding gain (loss) on derivatives | 5,331 |  | 13,981 |  |
EQM Transmission | Usage Fees Under Interruptible Contract |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 1,350 |  | 8,782 |  |
Other sources of revenue, excluding gain (loss) on derivatives | 0 |  | 0 |  |
Total, excluding gain (loss) on derivatives | 1,350 |  | 8,782 |  |
EQM Water | Water Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenues from contracts with customers | 22,373 |  | 93,438 |  |
Other sources of revenue, excluding gain (loss) on derivatives | 0 |  | 0 |  |
Total, excluding gain (loss) on derivatives | $ 22,373 |  | $ 93,438 |  |
Minimum |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract term |  |  |  |  | 8 years
Maximum |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Contract term |  |  |  |  | 15 years

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