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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) Counterparty Customer | Dec. 31, 2018 USD ($) Customer | Dec. 31, 2017 USD ($) Customer | Dec. 31, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net brokered margin gain (loss) |  |  |  |  |  |  |  |  |  | $ (14,200,000) | $ (16,300,000) | $ (5,700,000) |
Allowance for doubtful accounts on accounts receivable |  | $ 8,784,000 |  |  |  | $ 6,118,000 |  |  |  | 8,784,000 | 6,118,000 |  |
Bad debt (income) expense |  |  |  |  |  |  |  |  |  | 4,341,000 | (1,000,000) | 1,550,000 |
Net book value of unproved properties | [1] | 868,180,000 |  |  |  | 2,110,277,000 |  |  |  | 868,180,000 | 2,110,277,000 | 2,644,000,000 |
Abandonment and impairment of unproved properties |  | 1,193,711,000 | $ 16,202,000 | $ 12,770,000 | $ 12,659,000 | 441,750,000 | $ 6,549,000 | $ 54,922,000 | $ 11,773,000 | 1,235,342,000 | 514,994,000 | 269,725,000 |
Depreciation expense |  |  |  |  |  |  |  |  |  | $ 5,000,000.0 | 6,000,000.0 | $ 7,700,000 |
Lease, practical expedients, package [true false] |  |  |  |  |  |  |  |  |  | true |  |  |
Marketable securities held in deferred compensation plans |  | 62,000,000.0 |  |  |  | 57,300,000 |  |  |  | $ 62,000,000.0 | 57,300,000 |  |
Other investments including surface acreage |  | 9,600,000 |  |  |  | $ 9,100,000 |  |  |  | $ 9,600,000 | $ 9,100,000 |  |
Number of customers accounted more than 10% of total oil and gas revenues | Customer |  |  |  |  |  |  |  |  |  | 1 | 1 | 1 |
Number of counterparties | Counterparty |  |  |  |  |  |  |  |  |  | 3 |  |  |
Number of financial institutions included in counter parties | Counterparty |  |  |  |  |  |  |  |  |  | 20 |  |  |
Number of counterparties amount payable | Counterparty |  |  |  |  |  |  |  |  |  | 1 |  |  |
Number of counterparties amount receivable | Counterparty |  |  |  |  |  |  |  |  |  | 2 |  |  |
Counterparties not in Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net derivative liability |  | 6,700,000 |  |  |  |  |  |  |  | $ 6,700,000 |  |  |
One Counterparty |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net derivative liability |  | 12,600,000 |  |  |  |  |  |  |  | 12,600,000 |  |  |
Two Counterparties |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative amount receivable |  | $ 5,900,000 |  |  |  |  |  |  |  | $ 5,900,000 |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term leases initial term |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Lessee, operating lease, contract term |  | 1 month |  |  |  |  |  |  |  | 1 month |  |  |
Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net book value of unproved properties |  | $ 868,200,000 |  |  |  |  |  |  |  | $ 868,200,000 |  |  |
North Louisiana |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Abandonment and impairment of unproved properties |  |  |  |  |  |  |  |  |  | 1,200,000,000 | $ 436,000,000.0 |  |
Natural Gas and Oil Properties | Northwest Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |  |  | $ 0
Adjustments of the asset retirement liability additional expense |  |  |  |  |  |  |  |  |  | $ 213,000 | $ 9,800,000 | $ 158,000 |
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 |  |  |
Office Space |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, operating sublease, option to terminate |  |  |  |  |  |  |  |  |  | All of our subleases have terms that end in 2020 or 2022. The sublease agreements are non-cancelable through the end of the term and both parties have substantive rights to terminate the lease when the term is complete. |  |  |
Expected subleases through beginning of 2022 |  | $ 3,100,000 |  |  |  |  |  |  |  | $ 3,100,000 |  |  |
Office Space | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, operating lease, contract term |  | 1 year |  |  |  |  |  |  |  | 1 year |  |  |
Office Space | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, operating lease, contract term |  | 15 years |  |  |  |  |  |  |  | 15 years |  |  |
Field Equipment |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, Operating Lease, Option to Extend |  |  |  |  |  |  |  |  |  | Our compressor and cooler arrangements are typically structured with a non-cancelable primary term of one to two years and continue thereafter on a month-to-month basis subject to termination by either party with thirty days notice. |  |  |
Lessee Operating Lease Notice Period for Renewal |  |  |  |  |  |  |  |  |  | 30 days |  |  |
Field Equipment | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, operating lease, contract term |  | 1 year |  |  |  |  |  |  |  | 1 year |  |  |
Field Equipment | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, operating lease, contract term |  | 2 years |  |  |  |  |  |  |  | 2 years |  |  |
Vehicle Fleet |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee Operating Lease Notice Period for Renewal |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Lessee operating lease contract of team description |  |  |  |  |  |  |  |  |  | Our vehicle agreements are non-cancelable for a minimum term of one year and a maximum term of four to eight years depending on the type of vehicle. However, we have assumed a term of three years based on the period covered by options to terminate that we are reasonably certain to exercise. |  |  |
Vehicle Fleet | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, operating lease, contract term |  | 1 year |  |  |  |  |  |  |  | 1 year |  |  |
Lessee, operating lease, non-cancelable maximum contract term, depending on type of vehicle |  |  |  |  |  |  |  |  |  | 4 years |  |  |
Vehicle Fleet | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, operating lease, non-cancelable maximum contract term, depending on type of vehicle |  |  |  |  |  |  |  |  |  | 8 years |  |  |
Other Equipment |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, operating lease, contract term |  | 18 months |  |  |  |  |  |  |  | 18 months |  |  |
Lessee, Operating Lease, Option to Extend |  |  |  |  |  |  |  |  |  | This arrangement is structured with a non-cancellable primary term of eighteen months, with two optional extension periods of six months |  |  |
Lessee, operating lease, option to extend |  |  |  |  |  |  |  |  |  | true |  |  |
Lessee, operating lease, option to extend, term |  |  |  |  |  |  |  |  |  | 6 months |  |  |
Lessee, operating lease, existence of option to terminate |  |  |  |  |  |  |  |  |  | true |  |  |
[1] | Includes capitalized asset retirement costs and the associated accumulated amortization.

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