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Transactions with Affiliates - Summary of Affiliate Transactions Tables (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Related Party Transaction [Line Items]        
Revenues and other $ 685,054 $ 518,078 [1] $ 1,356,937 $ 1,019,132 [1]
Equity income, net – affiliates 63,598 49,430 [1] 121,590 79,659 [1]
Cost of product [2] 122,877 95,656 [1] 236,940 189,974 [1]
Operation and maintenance [2] 148,431 112,789 [1] 291,260 209,584 [1]
General and administrative [2] 30,027 15,597 [1] 52,871 31,426 [1]
Operating expenses 437,531 453,464 [1] 847,888 759,996 [1]
Interest income 4,225 4,225 [1] 8,450 8,450 [1]
Interest expense [3] 79,472 42,245 [1] 145,348 80,260 [1]
Distributions to unitholders [4]     408,234 244,658 [1]
Above-market component of swap agreements with Anadarko 0 13,839 7,407 [4] 28,121 [1],[4]
WES Operating [Member]        
Related Party Transaction [Line Items]        
Revenues and other 685,054 518,078 [1] 1,356,937 1,019,132 [1]
Equity income, net – affiliates 63,598 49,430 [1] 121,590 79,659 [1]
Cost of product [5] 122,877 95,656 [1] 236,940 189,974 [1]
Operation and maintenance [5] 148,431 112,789 [1] 291,260 209,584 [1]
General and administrative [5] 28,101 14,901 [1] 48,661 29,898 [1]
Operating expenses 435,605 452,768 [1] 843,678 758,468 [1]
Interest income 4,225 4,225 [1] 8,450 8,450 [1]
Interest expense [6] 79,472 41,937 [1] 145,103 78,889 [1]
Distributions to unitholders [7]     546,629 437,719 [1]
Above-market component of swap agreements with Anadarko [7]     7,407 28,121 [1]
Affiliates [Member]        
Related Party Transaction [Line Items]        
Revenues and other 385,184 289,544 [1] 763,621 574,720 [1]
Cost of product 68,225 38,001 124,397 72,820
Operation and maintenance 32,318 26,826 71,459 49,827
General and administrative 26,892 12,262 45,786 24,950
Operating expenses 127,435 77,089 241,642 147,597
Interest expense 20 1,409 1,853 1,986
APCWH Note Payable borrowings 0 81,343 11,000 187,908
Repayment of APCWH Note Payable 0 0 439,595 0
Distributions to unitholders 153,231 101,571 255,885 199,571
Affiliates [Member] | WES Operating [Member]        
Related Party Transaction [Line Items]        
Revenues and other 385,184 289,544 [1] 763,621 574,720 [1]
Cost of product 68,200 38,000 124,400 72,800
Operation and maintenance 32,300 26,800 71,500 49,800
General and administrative 26,380 12,044 44,878 24,523
Interest expense 20 1,400 1,900 2,000
Distributions to unitholders 283,271 127,204 448,173 251,368
Affiliates [Member] | WES Operating [Member]        
Related Party Transaction [Line Items]        
Distributions to unitholders $ 5,667 $ 1,881 $ 8,210 $ 3,731
[1]
Financial information has been recast to include the financial position and results attributable to AMA. See Note 1 and Note 3.
[2]
Cost of product includes product purchases from affiliates (as defined in Note 1) of $68.2 million and $124.4 million for the three and six months ended June 30, 2019, respectively, and $38.0 million and $72.8 million for the three and six months ended June 30, 2018, respectively. Operation and maintenance includes charges from affiliates of $32.3 million and $71.5 million for the three and six months ended June 30, 2019, respectively, and $26.8 million and $49.8 million for the three and six months ended June 30, 2018, respectively. General and administrative includes charges from affiliates of $26.9 million and $45.8 million for the three and six months ended June 30, 2019, respectively, and $12.3 million and $25.0 million for the three and six months ended June 30, 2018, respectively. See Note 6.
[3]
Includes affiliate (as defined in Note 1) amounts of $0.02 million and $1.9 million for the three and six months ended June 30, 2019, respectively, and $1.4 million and $2.0 million for the three and six months ended June 30, 2018, respectively. See Note 1 and Note 10.
[4]
See Note 6.
[5]
Cost of product includes product purchases from affiliates (as defined in Note 1) of $68.2 million and $124.4 million for the three and six months ended June 30, 2019, respectively, and $38.0 million and $72.8 million for the three and six months ended June 30, 2018, respectively. Operation and maintenance includes charges from affiliates of $32.3 million and $71.5 million for the three and six months ended June 30, 2019, respectively, and $26.8 million and $49.8 million for the three and six months ended June 30, 2018, respectively. General and administrative includes charges from affiliates of $26.4 million and $44.9 million for the three and six months ended June 30, 2019, respectively, and $12.0 million and $24.5 million for the three and six months ended June 30, 2018, respectively. See Note 6.
[6]
Includes affiliate (as defined in Note 1) amounts of $0.02 million and $1.9 million for the three and six months ended June 30, 2019, respectively, and $1.4 million and $2.0 million for the three and six months ended June 30, 2018, respectively. See Note 1 and Note 10.
[7]
See Note 6.