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Related-Party Transactions - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
May 31, 2008
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]        
Capital contribution for the above-market component of swap agreements with Anadarko [1]     $ 7,407,000  
Incentive Plans [Member]        
Related Party Transaction [Line Items]        
Allocated equity-based compensation expense   $ 4,100,000 $ 1,800,000  
Natural Gas [Member]        
Related Party Transaction [Line Items]        
Related-party throughput percentage   42.00% 36.00%  
Crude Oil and NGLs Member]        
Related Party Transaction [Line Items]        
Related-party throughput percentage   89.00% 81.00%  
Produced water [Member]        
Related Party Transaction [Line Items]        
Related-party throughput percentage   89.00% 84.00%  
WES Operating [Member]        
Related Party Transaction [Line Items]        
Capital contribution for the above-market component of swap agreements with Anadarko [2]     $ 7,407,000  
Cash contribution from related party   $ 20,000,000.0    
Affiliates [Member]        
Related Party Transaction [Line Items]        
Operating lease, fixed-lease revenue   43,900,000    
Operating lease, variable-lease revenue   15,600,000    
Note receivable - Anadarko $ 260,000,000.0      
Fixed annual rate for note receivable bearing interest 6.50%      
Interest receivable   2,800,000    
Allowance for expected credit loss   2,100,000    
Affiliates [Member] | Commodity-Price Swap Agreement [Member]        
Related Party Transaction [Line Items]        
Net gains (losses) on commodity-price swap agreements     $ (700,000)  
Affiliates [Member] | Level-2 Inputs [Member] | Valuation, Market Approach [Member]        
Related Party Transaction [Line Items]        
Fair value of the note receivable   $ 153,600,000   $ 337,700,000
[1]
See Note 6.
[2]
See Note 6.