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Variable Interest Entities - Investments (Detail) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 02, 2022	Feb. 28, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Investments in and Advances to Affiliates [Line Items]
Contributions to equity method investments			$ 22,874	$ 108	$ 24,265	$ 1,398
Carrying value of investment			54,582	$ 36,902	54,582	$ 36,902	$ 29,628	$ 35,532	$ 45,088	$ 46,503
NGP ET IV
Investments in and Advances to Affiliates [Line Items]
Carrying value of investment			10,700		10,700			$ 8,800
NGP ET IV
Investments in and Advances to Affiliates [Line Items]
Funding commitment	$ 25,000
Contributions to investee to date			11,200		11,200
Gavin Generation
Investments in and Advances to Affiliates [Line Items]
Funding commitment		$ 25,000
Contributions to investee to date			22,100		22,100
Carrying value of investment			$ 22,600		$ 22,600
VIE, Not Primary Beneficiary | NGP ET IV | NGP ET IV
Investments in and Advances to Affiliates [Line Items]
Ownership percentage by limited partners	3.60%
VIE, Not Primary Beneficiary | Gavin Generation | Gavin Generation
Investments in and Advances to Affiliates [Line Items]
Ownership percentage by limited partners		5.40%

X

- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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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

No definition available.

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- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

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- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

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- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 45
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