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Related-Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
May 31, 2008
Related Party Transaction [Line Items]              
Right-of-use asset recognized     $ 71,725,000 $ 38,985,000      
Unvested equity-based compensation expense     $ 27,400,000        
Weighted-average term of unvested awards     1 year 1 month 6 days        
Above-market component of swap agreements with Anadarko [1]         $ 7,407,000    
WES Operating [Member]              
Related Party Transaction [Line Items]              
Cash contribution from related party   $ 20,000,000          
Above-market component of swap agreements with Anadarko [2]         7,407,000    
WES Operating [Member] | Maximum [Member] | APCWH Note Payable [Member]              
Related Party Transaction [Line Items]              
APCWH Note Payable, maximum borrowing           $ 500,000,000  
Occidental [Member]              
Related Party Transaction [Line Items]              
Right-of-use asset recognized $ 30,000,000            
Present value of reduced usage fees $ 30,000,000            
Related Parties [Member]              
Related Party Transaction [Line Items]              
Materials and supplies inventory         18,400,000    
Anadarko note receivable             $ 260,000,000
Related Parties [Member] | Commodity-Price Swap Agreements [Member]              
Related Party Transaction [Line Items]              
Loss on swap agreements with Anadarko         (700,000)    
Related Parties [Member] | Incentive Plans [Member]              
Related Party Transaction [Line Items]              
Allocated equity-based compensation expense     $ 10,100,000 $ 14,600,000 $ 12,900,000    
Unvested equity-based compensation expense     $ 2,200,000        
Weighted-average term of unvested awards     6 months        
Natural Gas [Member]              
Related Party Transaction [Line Items]              
Related-party throughput percentage     36.00% 41.00% 38.00%    
Crude Oil and NGLs Member]              
Related Party Transaction [Line Items]              
Related-party throughput percentage     89.00% 88.00% 84.00%    
Produced water [Member]              
Related Party Transaction [Line Items]              
Related-party throughput percentage     87.00% 87.00% 82.00%    
[1] See Note 6.
[2] See Note 6.