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EMPLOYEE BENEFITS - Defined Contribution Plan Narrative (Details) | 12 Months Ended
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Dec. 31, 2021
Defined Contribution Plan, 401K |
Defined Contribution Plan Disclosure [Line Items] |
Employer matching contribution (as a percentage) | 100.00%
Percentage of employees' pay (up to) | 3.00%
Defined Contribution Plan, Alternate Contribution 401K |
Defined Contribution Plan Disclosure [Line Items] |
Employer matching contribution (as a percentage) | 50.00%
Percentage of employees' pay (up to) | 8.00%

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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. + Details
Name: | us-gaap_DefinedContributionPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PlanNameAxis=es_DefinedContributionPlan401KMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PlanNameAxis=es_DefinedContributionPlanAlternateContribution401KMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |