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Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Revenue from Contracts with Customer [Line Items]
Accounts receivable, net	$ 822,747	$ 773,197
Customers [Member]
Revenue from Contracts with Customer [Line Items]
Accounts receivable, net	$ 807,500	$ 737,000

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: