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v3.20.2

Fair Value Measurements - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) Counterparty | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Interest and dividends | $ 124,000 |  | $ 184,000 | $ 272,000 | $ 363,000 |
Mark-to-market gain (loss) | 7,600,000 |  | $ 1,500,000 | (3,000,000.0) | 6,600,000 |
Deficiency charges | 18,200,000 |  |  |  |  |
Allowance for doubtful accounts on accounts receivable | 5,901,000 |  |  | $ 5,901,000 |  | $ 8,784,000
Number of derivative counterparties | Counterparty |  |  |  | 21 |  |
Number of counter parties that are not participants in bank credit facility | Counterparty |  |  |  | 5 |  |
Counterparties not in Facility |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Net derivative asset | (5,100,000) |  |  | $ (5,100,000) |  |
One Counterparty Not in Facility |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Net derivative asset | $ 473,000 |  |  | $ 473,000 |  |
North Louisiana | Level 2 |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impairment on natural gas and oil properties |  | $ 77,000,000.0 |  |  |  |
Processing agreement extended period |  | 10 years |  |  |  |
Fair Value, Measurements, Nonrecurring | North Louisiana |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impairment on natural gas and oil properties |  |  |  |  |  | $ 1,093,531,000
Natural Gas and Oil Properties | Fair Value, Measurements, Nonrecurring |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impairment on natural gas and oil properties |  |  |  |  | $ 0 |

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