Debtor-in-Possession, Distribution of Cash

No definition available.

Name:	eva_DebtorInPossessionDistributionOfCash
Namespace Prefix:	eva_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Debtor-in-Possession, Equity Interests, Percentage Following Dilution

+ References

No definition available.

+ Details

Name:	eva_DebtorInPossessionEquityInterestsPercentageFollowingDilution
Namespace Prefix:	eva_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debtor-in-Possession, Equity Right Offering, Amount

+ References

No definition available.

+ Details

Name:	eva_DebtorInPossessionEquityRightOfferingAmount
Namespace Prefix:	eva_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount debtor-in-possession financing arranged (but not necessarily all borrowed).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481435/852-10-45-18

+ Details

Name:	us-gaap_DebtorInPossessionFinancingAmountArranged
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_UnusualRiskOrUncertaintyLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	eva_DebtorInPossessionTypeAxis=eva_ExistingEquityInterestsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=eva_DIPFinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=eva_FirstLienSeniorSecuredExitFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Event - Bankruptcy Filing (Details) - Subsequent Event - USD ($) $ in Millions	Aug. 30, 2024	Mar. 15, 2024
Unusual Risk or Uncertainty [Line Items]
Debtor-in-possession, equity right offering, amount	$ 250.0
Existing Equity Interests
Unusual Risk or Uncertainty [Line Items]
Debtor-in-possession, distribution of cash	$ 1.0
Debtor-in-possession, equity interests, percentage following dilution	0.00%
Maximum
Unusual Risk or Uncertainty [Line Items]
Debtor-in-possession, distribution of cash	$ 18.0
Minimum
Unusual Risk or Uncertainty [Line Items]
Debtor-in-possession, distribution of cash	13.0
DIP Financing
Unusual Risk or Uncertainty [Line Items]
Debtor-in-possession financing, amount arranged		$ 500.0
First Lien Senior Secured Exit Facility
Unusual Risk or Uncertainty [Line Items]
Senior secured revolving credit facility	$ 1,000.0