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Acquisitions and Divestitures - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 18, 2019
Dec. 14, 2018
Jun. 27, 2018
Jun. 01, 2018
Mar. 17, 2017
Mar. 14, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]                  
Acquisition, net investment             $ 162,615    
Affiliates [Member]                  
Property, Plant and Equipment [Line Items]                  
Cash payment             254 $ 3,910 $ 716,465
Settlement of the Deferred purchase price obligation - Anadarko [1]             0 37,346 0
Proceeds from the sale of assets             0 0 623
Deferred Purchase Price Obligation - Anadarko [Member] | Affiliates [Member]                  
Property, Plant and Equipment [Line Items]                  
Settlement of the Deferred purchase price obligation - Anadarko [2]             $ 0 $ 37,346 0
Western Gas Partners, LP [Member]                  
Property, Plant and Equipment [Line Items]                  
WES units issued             1,128,782 885,760  
Western Gas Partners, LP [Member] | Newcastle System [Member]                  
Property, Plant and Equipment [Line Items]                  
Proceeds from the sale of assets   $ 3,200              
Gain (loss) on sale of assets             $ 600    
Western Gas Partners, LP [Member] | Helper and Clawson Systems [Member]                  
Property, Plant and Equipment [Line Items]                  
Gain (loss) on sale of assets               $ 16,300  
Western Gas Partners, LP [Member] | Hugoton System [Member]                  
Property, Plant and Equipment [Line Items]                  
Gain (loss) on sale of assets                 (12,000)
Goodwill allocated to divestiture                 $ 1,600
Western Gas Partners, LP [Member] | Revolving Credit Facility [Member] | WES RCF [Member]                  
Property, Plant and Equipment [Line Items]                  
Borrowings - revolving credit facility             $ 540,000 370,000  
Western Gas Partners, LP [Member] | Non-Operated Marcellus Interest [Member]                  
Property, Plant and Equipment [Line Items]                  
Percentage ownership interest         33.75%        
Western Gas Partners, LP [Member] | Newcastle System [Member] | Newcastle System [Member]                  
Property, Plant and Equipment [Line Items]                  
Percentage ownership interest   50.00%              
Western Gas Partners, LP [Member] | Red Bluff Express Pipeline LLC [Member] | Subsequent Event [Member]                  
Property, Plant and Equipment [Line Items]                  
Ownership percentage acquired 30.00%                
Acquisition, net investment $ 92,500                
Western Gas Partners, LP [Member] | Whitethorn [Member]                  
Property, Plant and Equipment [Line Items]                  
Ownership percentage acquired       20.00%          
Acquisition, net investment       $ 150,600          
Western Gas Partners, LP [Member] | Cactus II [Member]                  
Property, Plant and Equipment [Line Items]                  
Ownership percentage acquired     15.00%            
Acquisition, net investment     $ 12,100            
Western Gas Partners, LP [Member] | Delaware Basin JV Gathering LLC [Member]                  
Property, Plant and Equipment [Line Items]                  
Ownership percentage acquired         50.00%        
Cash payment         $ 155,000        
Net gain from property exchange               125,700  
Western Gas Partners, LP [Member] | Delaware Basin JV Gathering LLC [Member] | Delaware Basin JV Gathering LLC [Member]                  
Property, Plant and Equipment [Line Items]                  
Percentage ownership interest         50.00%        
Western Gas Partners, LP [Member] | Delaware Basin JV Gathering LLC [Member] | Deferred Purchase Price Obligation - Anadarko [Member] | Affiliates [Member]                  
Property, Plant and Equipment [Line Items]                  
Settlement of the Deferred purchase price obligation - Anadarko               $ 37,346  
Western Gas Partners, LP [Member] | Springfield [Member]                  
Property, Plant and Equipment [Line Items]                  
Ownership percentage acquired           50.10%      
Acquisition price           $ 750,000      
Cash payment for acquisition           712,500      
Western Gas Partners, LP [Member] | Springfield [Member] | Revolving Credit Facility [Member] | WES RCF [Member]                  
Property, Plant and Equipment [Line Items]                  
Borrowings - revolving credit facility           $ 247,500      
Western Gas Partners, LP [Member] | Springfield [Member] | Anadarko [Member] | Common Units [Member]                  
Property, Plant and Equipment [Line Items]                  
WES units issued           1,253,761      
Western Gas Partners, LP [Member] | Springfield [Member] | Western Gas Equity Partners, LP [Member] | Common Units [Member]                  
Property, Plant and Equipment [Line Items]                  
WES units issued           835,841      
[1] See Note 3.
[2] Represents the cash payment to Anadarko for the settlement of the Deferred purchase price obligation - Anadarko (see Note 3).