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Related-Party Transactions - Summary of WES Operating Related-Party Transactions Tables (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Consolidated statements of operations [Abstract]          
General and administrative $ 50,409 $ 41,578 $ 139,973 $ 118,466  
Consolidated balance sheets [Abstract]          
Accounts receivable, net 583,652   583,652   $ 452,880
Accounts and imbalance payables 341,220   341,220   210,691
Consolidated statements of cash flows [Abstract]          
Distributions to WES Operating unitholders [1]     (398,896) (563,579)  
Related Parties [Member]          
Consolidated statements of operations [Abstract]          
General and administrative 1,808 7,607 13,003 40,456  
Consolidated balance sheets [Abstract]          
Accounts receivable, net 289,402   289,402   291,253
Accounts and imbalance payables 42,384   42,384   6,664
Consolidated statements of cash flows [Abstract]          
Distributions to WES Operating unitholders     (195,205) (301,219)  
WES Operating [Member]          
Consolidated statements of operations [Abstract]          
General and administrative 50,689 41,483 137,767 115,783  
Consolidated balance sheets [Abstract]          
Accounts receivable, net 583,652   583,652   407,549
Accounts and imbalance payables 382,406   382,406   210,532
Consolidated statements of cash flows [Abstract]          
Distributions to WES Operating unitholders [1]     (496,555) (577,122)  
WES Operating [Member] | Related Parties [Member]          
Consolidated statements of operations [Abstract]          
General and administrative 2,775 $ 8,314 15,061 41,220  
Consolidated balance sheets [Abstract]          
Accounts receivable, net 289,402   289,402   246,083
Accounts and imbalance payables $ 83,576   83,576   $ 6,664
Consolidated statements of cash flows [Abstract]          
Distributions to WES Operating unitholders     $ (496,555) $ (577,122)  
[1] See Note 6.