Debt - Debt Outstanding Table (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total short-term debt, principal	$ 13,062	$ 1,011,545
Total short-term debt, carrying value	13,062	1,011,032
Total long-term debt, carrying value	6,924,291	6,926,647
Valuation, Market Approach [Member] | Level-2 Inputs [Member]
Debt Instrument [Line Items]
Short-term debt, fair value	13,062	1,008,622
Long-Term Debt Obligations [Member]
Debt Instrument [Line Items]
Total long-term debt, principal	6,993,174	7,000,163
Total long-term debt, carrying value	6,924,291	6,926,647
Long-Term Debt Obligations [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]
Debt Instrument [Line Items]
Long-term debt, fair value	6,737,578	6,571,456
WES Operating [Member]
Debt Instrument [Line Items]
Total short-term debt, carrying value	13,062	1,011,032
Total long-term debt, carrying value	6,924,291	6,926,647
WES Operating [Member] | Finance Lease Liability, Short Term [Member]
Debt Instrument [Line Items]
Finance leases - short-term debt	13,062	10,956
WES Operating [Member] | Finance Lease Liability, Long Term [Member]
Debt Instrument [Line Items]
Finance leases - long-term debt	16,340	23,329
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	13,062	10,956
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	16,340	23,329
WES Operating [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Principal	6,976,834	6,976,834
Long-term debt, carrying value	6,907,951	6,903,318
WES Operating [Member] | Senior Notes [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]
Debt Instrument [Line Items]
Long-term debt, fair value	6,721,238	6,548,127
WES Operating [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Principal	0	1,000,589
Short-term debt, carrying value	0	1,000,076
WES Operating [Member] | Senior Notes [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]
Debt Instrument [Line Items]
Short-term debt, fair value	$ 0	$ 997,666