Debt - Debt Outstanding Table (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Total short-term debt, principal	$ 445,752	$ 449,125
Total short-term debt, carrying value	445,603	448,825
Total long-term debt, carrying value	8,194,171	8,195,170
Valuation, Market Approach [Member] \| Level-2 Inputs [Member]
Debt Instrument [Line Items]
Short-term debt, fair value	445,752	449,543
Long-Term Debt Obligations [Member]
Debt Instrument [Line Items]
Total long-term debt, principal	8,247,475	8,248,754
Total long-term debt, carrying value	8,194,171	8,195,170
Long-Term Debt Obligations [Member] \| Valuation, Market Approach [Member] \| Level-2 Inputs [Member]
Debt Instrument [Line Items]
Long-term debt, fair value	7,909,692	8,022,665
WES Operating [Member]
Debt Instrument [Line Items]
Total short-term debt, carrying value	445,603	448,825
Total long-term debt, carrying value	8,194,171	8,195,170
WES Operating [Member] \| Finance Lease Liability, Short Term [Member]
Debt Instrument [Line Items]
Finance leases - short-term debt	5,247	8,620
WES Operating [Member] \| Finance Lease Liability, Long Term [Member]
Debt Instrument [Line Items]
Finance leases - long-term debt	11,146	12,425
WES Operating [Member] \| Valuation, Market Approach [Member] \| Level-2 Inputs [Member] \| Finance Lease Liability, Short Term [Member]
Debt Instrument [Line Items]
Finance leases - short-term debt	5,247	8,620
WES Operating [Member] \| Valuation, Market Approach [Member] \| Level-2 Inputs [Member] \| Finance Lease Liability, Long Term [Member]
Debt Instrument [Line Items]
Finance leases - long-term debt	11,146	12,425
WES Operating [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Principal	8,236,329	8,236,329
Long-term debt, carrying value	8,183,025	8,182,745
WES Operating [Member] \| Senior Notes [Member] \| Valuation, Market Approach [Member] \| Level-2 Inputs [Member]
Debt Instrument [Line Items]
Long-term debt, fair value	7,898,546	8,010,240
WES Operating [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Principal	440,505	440,505
Short-term debt, carrying value	440,356	440,205
WES Operating [Member] \| Senior Notes [Member] \| Valuation, Market Approach [Member] \| Level-2 Inputs [Member]
Debt Instrument [Line Items]
Short-term debt, fair value	$ 440,505	$ 440,923

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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