v3.25.3

Leases - Narrative (Details) $ in Thousands	9 Months Ended
Leases - Narrative (Details) $ in Thousands	Sep. 30, 2025 USD ($) facility
Operating Leased Assets [Line Items]
Right-of-use asset carrying value	$ 5,397
Other Income
Operating Leased Assets [Line Items]
Gain recognized in other income	$ 600
RNG Fuel
Operating Leased Assets [Line Items]
Number of facilities \| facility	2

The net gain (loss) arising from the lessor's sale of assets held- or available-for-lease under contractual arrangements classified as operating leases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 840
-SubTopic 30
-Name Accounting Standards Codification
-Section 40
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481222/840-30-40-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 40
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482161/360-10-40-3A

+ Details

Name:	us-gaap_GainLossOnSaleOfLeasedAssetsNetOperatingLeases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

Name:	us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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.

+ Details

Name:	us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Facilities

+ References

No definition available.

+ Details

Name:	wdq_NumberOfFacilities
Namespace Prefix:	wdq_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=wdq_NaturalGasRenewableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

OPAL Fuels Inc. 10-Q