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Transactions with Affiliates - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
May 31, 2008
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]        
Note receivable - Anadarko   $ 260,000,000   $ 260,000,000
Above-market component of swap agreements with Anadarko [1]   14,282,000    
Contributions of equity-based compensation to WES by Anadarko   $ 1,470,000    
Western Gas Equity Partners Long Term Incentive Plan [Member]        
Related Party Transaction [Line Items]        
Units vesting period   3 years    
Equity-based compensation expense   $ 62,000 $ 55,000  
Independent Director [Member] | Western Gas Equity Partners Long Term Incentive Plan [Member]        
Related Party Transaction [Line Items]        
Units vesting period   1 year    
Western Gas Partners, LP [Member] | Anadarko Incentive Plan [Member]        
Related Party Transaction [Line Items]        
Equity-based compensation expense   $ 2,100,000 1,200,000  
Contributions of equity-based compensation to WES by Anadarko   $ 1,500,000    
Western Gas Partners, LP [Member] | Western Gas Partners Long Term Incentive Plan [Member]        
Related Party Transaction [Line Items]        
Units vesting period   3 years    
Equity-based compensation expense   $ 100,000 $ 100,000  
Western Gas Partners, LP [Member] | Natural Gas [Member] | Gathering, Treating, Transportation and Disposal [Member]        
Related Party Transaction [Line Items]        
Affiliate throughput percent   36.00% 32.00%  
Western Gas Partners, LP [Member] | Natural Gas [Member] | Processing [Member]        
Related Party Transaction [Line Items]        
Affiliate throughput percent   36.00% 49.00%  
Western Gas Partners, LP [Member] | Crude Oil, NGL and Produced Water [Member] | Gathering, Treating, Transportation and Disposal [Member]        
Related Party Transaction [Line Items]        
Affiliate throughput percent   63.00% 54.00%  
Western Gas Partners, LP [Member] | Affiliates [Member]        
Related Party Transaction [Line Items]        
Note receivable - Anadarko $ 260,000,000 $ 260,000,000    
Note receivable, due date May 14, 2038      
Fixed annual rate for note receivable bearing interest 6.50%      
Net gains (losses) on commodity price swap agreements   (1,243,000) $ (500,000)  
Western Gas Partners, LP [Member] | Affiliates [Member] | Level 2 Inputs [Member] | Market Approach Valuation Technique [Member]        
Related Party Transaction [Line Items]        
Fair value of the note receivable   $ 316,200,000   $ 325,200,000
Western Gas Partners, LP [Member] | Independent Director [Member] | Western Gas Partners Long Term Incentive Plan [Member]        
Related Party Transaction [Line Items]        
Units vesting period   1 year    
[1] See Note 6.