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Transactions with Affiliates - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2008
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]            
Note receivable - Anadarko   $ 260,000,000   $ 260,000,000   $ 260,000,000 [1]
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   5.00% 6.00% 6.00% 7.00%  
Natural Gas [Member] | Processing [Member]            
Related Party Transaction [Line Items]            
Affiliate throughput percent   42.00% 39.00% 41.00% 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% 82.00% 83.00% 80.00%  
Commodity Price Swap Agreement [Member]            
Related Party Transaction [Line Items]            
Net gains (losses) on commodity price swap agreements   $ 0 $ (1,372,000) $ (667,000) $ (2,615,000)  
Affiliates [Member] | Commodity Price Swap Agreement [Member]            
Related Party Transaction [Line Items]            
Net gains (losses) on commodity price swap agreements   0 $ (1,400,000) (700,000) $ (2,600,000)  
Affiliates [Member] | Level 2 Inputs [Member] | Valuation, Market Approach [Member]            
Related Party Transaction [Line Items]            
Fair value of the note receivable   325,600,000   $ 325,600,000   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]
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.