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Divestitures - Additional Information (Details) $ in Thousands, a in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 18, 2018 USD ($) MMcfe mi well a compressor_station | Jun. 19, 2018 USD ($) MMcfe mi well compressor_station | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of productive assets |  | $ 57,700 |  |  |  |  |  |
Number of wells sold | well |  | 970 |  |  |  |  |  |
Reduction in sales volume | MMcfe |  | 20 |  |  |  |  |  |
Number of miles of gathering lines sold | mi |  | 350 |  |  |  |  |  |
Number of compressors sold | compressor_station |  | 26 |  |  |  |  |  |
Impairment of long-lived assets |  |  | $ 259,300 |  | $ 2,300,000 |  |  |
Oil and gas asset |  |  |  |  | $ 1,000,000 |  |  |
Gain (loss) on disposal and impairment |  |  | $ (259,279) | $ (118,100) |  | $ 0 | $ (2,706,438) | $ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of productive assets | $ 523,600 |  |  |  |  |  |  |
Number of wells sold | well | 12,000 |  |  |  |  |  |  |
Reduction in sales volume | MMcfe | 200 |  |  |  |  |  |  |
Number of miles of gathering lines sold | mi | 6,400 |  |  |  |  |  |  |
Number of compressors sold | compressor_station | 59 |  |  |  |  |  |  |
Number of acres sold | a | 2.5 |  |  |  |  |  |  |

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