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Transactions with Affiliates - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2008
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]            
Note receivable - Anadarko   $ 260,000,000   $ 260,000,000   $ 260,000,000 [1]
Materials and supplies inventory   25,151,000   25,151,000   9,665,000
Anadarko Incentive Plan [Member]            
Related Party Transaction [Line Items]            
Allocated equity-based compensation expense   $ 3,500,000 $ 1,400,000 $ 9,300,000 $ 5,200,000  
Long-Term Incentive Plans [Member]            
Related Party Transaction [Line Items]            
Units vesting period       3 years    
Natural Gas [Member] | Gathering, Treating, Transportation, and Disposal [Member]            
Related Party Transaction [Line Items]            
Affiliate throughput percent   7.00% 8.00% 6.00% 7.00%  
Natural Gas [Member] | Processing [Member]            
Related Party Transaction [Line Items]            
Affiliate throughput percent   42.00% 41.00% 42.00% 40.00%  
Crude Oil, NGLs, and Produced Water [Member] | Gathering, Treating, Transportation, and Disposal [Member]            
Related Party Transaction [Line Items]            
Affiliate throughput percent   82.00% 91.00% 82.00% 85.00%  
Affiliates [Member]            
Related Party Transaction [Line Items]            
Materials and supplies inventory   $ 18,400,000   $ 18,400,000    
Affiliates [Member] | Commodity Price Swap Agreement [Member]            
Related Party Transaction [Line Items]            
Net gains (losses) on commodity price swap agreements   0 $ (3,700,000) (700,000) $ (6,400,000)  
Affiliates [Member] | Level-2 Inputs [Member] | Valuation, Market Approach [Member]            
Related Party Transaction [Line Items]            
Fair value of the note receivable   341,900,000   $ 341,900,000   279,600,000
Independent Director [Member] | Long-Term Incentive Plans [Member]            
Related Party Transaction [Line Items]            
Units vesting period       1 year    
WES Operating [Member]            
Related Party Transaction [Line Items]            
Note receivable - Anadarko   260,000,000   $ 260,000,000   260,000,000 [1]
Materials and supplies inventory   $ 25,151,000   $ 25,151,000   $ 9,665,000
WES Operating [Member] | Affiliates [Member]            
Related Party Transaction [Line Items]            
Note receivable - Anadarko $ 260,000,000.0          
Fixed annual rate for note receivable bearing interest 6.50%          
[1]
Financial information has been recast to include the financial position and results attributable to AMA. See Note 1 and Note 3.