Related-Party Transactions - Summary of WES Related-Party Transactions Tables (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Related Party Transaction [Line Items]
Revenues and other		$ 774,313	$ 671,883
Equity income, net – related parties		61,347	57,992
Cost of product	[1]	103,270	114,063
Operation and maintenance	[1]	159,191	142,829
General and administrative	[1]	40,465	22,844
Operating expenses		1,050,523	410,357
Interest income		4,225	4,225
Interest expense		88,586	65,876
Distributions to unitholders	[2]	281,786	131,910
Above-market component of swap agreements with Anadarko	[2]	0	7,407
Affiliates [Member]
Related Party Transaction [Line Items]
Revenues and other		482,385	378,437
Cost of product		77,903	56,172
Operation and maintenance		32,841	39,141
General and administrative		21,855	18,894
Operating expenses		132,599	114,207
Interest expense		43	1,833
APCWH Note Payable borrowings		0	11,000
Repayment of APCWH Note Payable		0	439,595
Distributions to unitholders		150,609	102,654
Affiliates [Member] | WES Operating [Member]
Related Party Transaction [Line Items]
Distributions to unitholders		$ 5,807	$ 2,543

[1] Cost of product includes product purchases from related parties (as defined in Note 1) of $77.9 million and $56.2 million for the three months ended March 31, 2020 and 2019, respectively. Operation and maintenance includes charges from related parties of $32.8 million and $39.1 million for the three months ended March 31, 2020 and 2019, respectively. General and administrative includes charges from related parties of $21.9 million and $18.9 million for the three months ended March 31, 2020 and 2019, respectively. See Note 6.

[2] See Note 6.