XML 70 R58.htm IDEA: XBRL DOCUMENT
v3.25.3

Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Commitments and Contingencies Disclosure [Abstract] |  |
Current Portion of Environmental Liabilities | $ 10,622,000 | $ 11,815,000
Long-term environmental liabilities | 42,147,000 | 46,585,000
Total environmental liabilities | $ 52,769,000 | $ 58,400,000

X
- Definition Current Portion of Environmental Liabilities + References No definition available. + Details
Name: | nvri_CurrentPortionOfEnvironmentalLiabilities
Namespace Prefix: | nvri_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total Environmental Liabilities + References No definition available. + Details
Name: | nvri_TotalEnvironmentalLiabilities
Namespace Prefix: | nvri_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Undiscounted amount of the accrual for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480102/450-20-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481931/410-30-50-7 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingenciesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration