Derivative Activities - Additional Information (Detail) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025 USD ($) MMBTU	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) MMBTU	Sep. 30, 2024 USD ($)
Derivative [Line Items]
Derivative Fair Value Income (Loss)	$ 92,946	$ 47,124	$ 88,736	$ 110,530
Commodity \| Natural Gas Basis Swaps
Derivative [Line Items]
Net derivative asset	$ (12,900)		$ (12,900)
Volume hedged \| MMBTU	180,282,500		180,282,500

The sum of the notional amount of derivative over the life of the entire contract, expressed in nonmonetary units. For example, the total number of British Thermal Unit (BTU) specified in a fuel oil forward purchase contract.

No definition available.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

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