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NONCONTROLLING INTERESTS - Variable Interest Entity (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2026 USD ($)
NONCONTROLLING INTERESTS |
Noncontrolling Interest | $ 3.8
VIE, ownership percentage | 50.00%
Outstanding loan balance | $ 4.5
Intercompany receivable amount | $ 3.2

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

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- Definition Portion of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a VIE that is attributable to the noncontrolling interest (previously referred to as minority interest). + References No definition available. + Details
Name: | us-gaap_NoncontrollingInterestInVariableInterestEntity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481203/810-10-50-5A + Details
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of inter-company loan receivable from consolidated variable interest entity. + References No definition available. + Details
Name: | wttr_InterCompanyLoanReceivableFromConsolidatedVie
Namespace Prefix: | wttr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of inter-company receivable from consolidated variable interest entity. + References No definition available. + Details
Name: | wttr_InterCompanyReceivableFromConsolidatedVie
Namespace Prefix: | wttr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant