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Summary of Significant Accounting Policies - Schedule of Derivative Contracts Volume and Prices (Parenthetical) (Detail)	Jun. 30, 2020 MMBTU $ / MMBTU
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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- Definition

Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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