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Acquisitions and Divestitures - Acquisitions Table (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 17, 2017
Mar. 14, 2016
Sep. 30, 2017
Revolving Credit Facility [Member] | WGP RCF [Member]      
Business Acquisition [Line Items]      
Borrowings - revolving credit facility   $ 25,000  
Western Gas Partners, LP [Member]      
Business Acquisition [Line Items]      
WES units issued     619,510
Western Gas Partners, LP [Member] | Revolving Credit Facility [Member] | WES RCF [Member]      
Business Acquisition [Line Items]      
Borrowings - revolving credit facility     $ 250,000
Western Gas Partners, LP [Member] | Springfield [Member]      
Business Acquisition [Line Items]      
Ownership percentage acquired [1]   50.10%  
Acquisition price   $ 750,000  
Cash payment for acquisition   $ 712,500  
Western Gas Partners, LP [Member] | Springfield [Member] | Common Units [Member]      
Business Acquisition [Line Items]      
WES units issued [1]   2,089,602  
Western Gas Partners, LP [Member] | Springfield [Member] | Common Units [Member] | Anadarko [Member]      
Business Acquisition [Line Items]      
WES units issued   1,253,761  
Western Gas Partners, LP [Member] | Springfield [Member] | Common Units [Member] | Western Gas Equity Partners, LP [Member]      
Business Acquisition [Line Items]      
WES units issued   835,841  
Western Gas Partners, LP [Member] | Springfield [Member] | Series A Preferred Units [Member]      
Business Acquisition [Line Items]      
WES units issued [1]   14,030,611  
Western Gas Partners, LP [Member] | Springfield [Member] | Revolving Credit Facility [Member] | WES RCF [Member]      
Business Acquisition [Line Items]      
Borrowings - revolving credit facility [1]   $ 247,500  
Western Gas Partners, LP [Member] | Delaware Basin JV Gathering LLC [Member]      
Business Acquisition [Line Items]      
Ownership percentage acquired [2] 50.00%    
Cash on hand [2] $ 155,000    
[1] WES acquired Springfield Pipeline LLC (“Springfield”) from Anadarko for $750.0 million, consisting of $712.5 million in cash and the issuance of 1,253,761 of WES common units. Springfield owns a 50.1% interest in an oil gathering system and a gas gathering system, such interest being referred to in this report as the “Springfield interest.” The Springfield oil and gas gathering systems (collectively, the “Springfield system”) are located in Dimmit, La Salle, Maverick and Webb Counties in South Texas. WES financed the cash portion of the acquisition through: (i) borrowings of $247.5 million on the WES RCF, (ii) the issuance of 835,841 of WES common units to WGP and (iii) the issuance of WES Series A Preferred units to private investors. See Note 4 for further information regarding WES’s Series A Preferred units. WGP financed the purchase of the WES common units by borrowing $25.0 million under the WGP RCF. See Note 9.
[2] WES acquired the Additional DBJV System Interest from a third party. See Property exchange below.