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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 USD ($) Counterparty Customer | Dec. 31, 2019 USD ($) Customer | Dec. 31, 2018 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Net brokered margin gain (loss) |  | $ (14,200,000) | $ (14,200,000) | $ (16,300,000)
Allowance for doubtful accounts on accounts receivable |  | 3,004,000 | 8,784,000 |
Bad debt (income) expense |  | 400,000 | 4,341,000 | (1,000,000)
Net book value of unproved properties | [1] | 859,766,000 | 868,180,000 | 2,110,277,000
Abandonment and impairment of unproved properties |  | 19,334,000 | 1,235,342,000 | 514,994,000
Depreciation expense |  | $ 2,600,000 | 5,000,000.0 | $ 6,000,000.0
Maximum amount term for short term leases |  | 1 year |  |
Marketable securities held in deferred compensation plans |  | $ 63,900,000 | 62,000,000.0 |
Other investments including surface acreage |  | $ 11,900,000 | $ 9,600,000 |
Number of customers accounted more than 10% of total oil and gas revenues | Customer |  | 0 | 1 | 1
Number of counterparties | Counterparty |  | 5 |  |
Number of financial institutions included in counter parties | Counterparty |  | 20 |  |
Number of counterparties amount payable | Counterparty |  | 3 |  |
Number of counterparties amount receivable | Counterparty |  | 2 |  |
Counterparties not in Facility |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Net derivative liability |  | $ 4,500,000 |  |
Counterparties in a Liability position |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Net derivative liability |  | 4,500,000 |  |
Counterparties in a Receivable position |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Derivative amount receivable |  | $ 5,200,000 |  |
Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Lessee, operating lease, contract term |  | 1 month |  |
Other property and equipment | Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Useful life of assets |  | 3 years |  |
Other property and equipment | Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Useful life of assets |  | 10 years |  |
North Louisiana |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Abandonment and impairment of unproved properties |  |  | $ 1,200,000,000 |
[1] | Includes capitalized asset retirement costs and the associated accumulated amortization.

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