v3.22.1

Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Revenue from Contracts with Customer [Line Items] |  |
Accounts receivable, net | $ 601,647 | $ 436,513
Customers [Member] |  |
Revenue from Contracts with Customer [Line Items] |  |
Accounts receivable, net | $ 589,500 | $ 424,600

X
- 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

X
- 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

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