Disposal Group, Including Discontinued Operation, Corporate Overhead

No definition available.

Name:	nvri_DisposalGroupIncludingDiscontinuedOperationCorporateOverhead
Namespace Prefix:	nvri_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Loss on Contracts (Reversal of Loss)

+ References

No definition available.

+ Details

Name:	nvri_LossOnContractsReversalOfLoss
Namespace Prefix:	nvri_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage Complete

+ References

No definition available.

+ Details

Name:	nvri_PercentageComplete
Namespace Prefix:	nvri_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479907/805-20-50-5

+ Details

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

- Definition

Losses recognized in the current period on contracts which are expected to generate losses, which are probable and can be reasonably estimated, in a future period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 605
-SubTopic 35
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481187/605-35-45-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

+ Details

Name:	us-gaap_LossOnContracts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	srt_MajorCustomersAxis=nvri_SBBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	nvri_ContractAxis=nvri_Contract2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=nvri_NetworkRailMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=nvri_DeutscheBahnMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsHeldforsaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SBB
Business Acquisition [Line Items]
Contract estimated forward loss provision for Harsco Rail Segment				$ 32,800	$ 44,500	$ 33,400
SBB \| Contract 2
Business Acquisition [Line Items]
Percentage Complete	85.00%			85.00%
Contract estimated forward loss provision for Harsco Rail Segment	$ 1,200		$ 6,100	$ 7,300
Network Rail
Business Acquisition [Line Items]
Percentage Complete	53.00%			53.00%
Contract estimated forward loss provision for Harsco Rail Segment	$ 9,200			$ 14,400
Reversal of loss			(23,600)
Deutsche Bahn
Business Acquisition [Line Items]
Percentage Complete	40.00%			40.00%
Contract estimated forward loss provision for Harsco Rail Segment	$ 29,200	$ 2,400	$ 8,300	$ 39,900
Discontinued Operations, Held-for-sale
Business Acquisition [Line Items]
Disposal Group, Including Discontinued Operation, Corporate Overhead				$ 4,200