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Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
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Revenue from Contracts with Customer [Line Items] |  |
Accounts receivable, net | $ 955,052 | $ 773,197
Customers [Member] |  |
Revenue from Contracts with Customer [Line Items] |  |
Accounts receivable, net | $ 933,500 | $ 737,000

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- Definition Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_AccountsAndOtherReceivablesNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition [Line Items] for Revenue from Contracts with Customer [Table] + References No definition available. + Details
Name: | wes_RevenuefromContractswithCustomerLineItems
Namespace Prefix: | wes_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_MajorCustomersAxis=wes_CustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |