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Summary of Significant Accounting Policies - Schedule of Derivative Contracts Volume and Prices (Parenthetical) (Detail) | Jun. 30, 2020 MMBTU $ / MMBTU
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Natural Gas Swaptions Call Contracts |
Derivative [Line Items] |
Volume | MMBTU | 120,450,000
Average price | 2.52
Natural Gas Swaptions Call Contracts | Swaption Contracts 2021 |
Derivative [Line Items] |
Volume | MMBTU | 71,250,000
Average price | 2.52
Natural Gas Swaptions Call Contracts | Swaption Contracts 2022 |
Derivative [Line Items] |
Volume | MMBTU | 49,200,000
Average price | 2.51
Natural Gas Swaptions Call Contracts | Swaption Contracts October 2020 |
Derivative [Line Items] |
Volume | MMBTU | 47,450,000
Average price | 2.53
Natural Gas Swaptions Call Contracts | Swaption Contracts November 2020 |
Derivative [Line Items] |
Volume | MMBTU | 7,300,000
Average price | 2.50
Natural Gas Swaptions Call Contracts | Swaption Contracts March 2021 |
Derivative [Line Items] |
Volume | MMBTU | 16,500,000
Average price | 2.50
Natural Gas Swaptions Call Contracts | Swaption Contracts March 2021 |
Derivative [Line Items] |
Volume | MMBTU | 5,400,000
Average price | 2.50
Natural Gas Swaptions Call Contracts | Swaption Contracts October 2021 |
Derivative [Line Items] |
Volume | MMBTU | 36,500,000
Average price | 2.52
Natural Gas Swaptions Call Contracts | Swaption Contracts November 2021 |
Derivative [Line Items] |
Volume | MMBTU | 7,300,000
Average price | 2.50
Natural Gas Derivative | Swaption Swap Contracts 2020 |
Derivative [Line Items] |
Volume | 38,640,000
Average price | 2.52
Natural Gas Derivatives |
Derivative [Line Items] |
Volume | MMBTU | 247,594,752
Average price | 2.58
Natural Gas Derivatives | Swaption Swap Contracts 2021 |
Derivative [Line Items] |
Volume | MMBTU | 23,650,000
Average price | 2.52

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