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Acquisitions and Divestitures - Acquisitions Table (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 14, 2016
Mar. 02, 2015
Mar. 31, 2016
Revolving Credit Facility [Member] | WGP RCF [Member]      
Business Acquisition [Line Items]      
Borrowings $ 25,000   $ 28,000
Western Gas Partners, LP [Member]      
Business Acquisition [Line Items]      
Units issued     323,584
Western Gas Partners, LP [Member] | Revolving Credit Facility [Member] | WES RCF [Member]      
Business Acquisition [Line Items]      
Borrowings     $ 330,000
Western Gas Partners, LP [Member] | Delaware Basin JV Gathering LLC [Member]      
Business Acquisition [Line Items]      
Percentage acquired [1]   100.00%  
Western Gas Partners, LP [Member] | Delaware Basin JV Gathering LLC [Member] | Delaware Basin JV Gathering System [Member]      
Business Acquisition [Line Items]      
Percentage acquired   50.00%  
Western Gas Partners, LP [Member] | Delaware Basin JV Gathering LLC [Member] | Deferred Purchase Price Obligation - Anadarko [Member] | Level 3 Inputs [Member]      
Business Acquisition [Line Items]      
Deferred purchase price obligation to Anadarko - acquisition date value [1]   $ 174,276  
Deferred purchase price obligation to Anadarko - future value   $ 282,800  
Western Gas Partners, LP [Member] | Springfield Pipeline LLC [Member]      
Business Acquisition [Line Items]      
Percentage acquired [2] 100.00%    
Acquisition price $ 750,000    
Western Gas Partners, LP [Member] | Springfield Pipeline LLC [Member] | Anadarko [Member]      
Business Acquisition [Line Items]      
Cash payment for acquisition $ 712,500    
Western Gas Partners, LP [Member] | Springfield Pipeline LLC [Member] | Common Units [Member]      
Business Acquisition [Line Items]      
Units issued 2,089,602 [2]   835,841
Western Gas Partners, LP [Member] | Springfield Pipeline LLC [Member] | Common Units [Member] | Anadarko [Member]      
Business Acquisition [Line Items]      
Units issued 1,253,761    
Western Gas Partners, LP [Member] | Springfield Pipeline LLC [Member] | Common Units [Member] | Western Gas Equity Partners, LP [Member]      
Business Acquisition [Line Items]      
Units issued 835,841    
Western Gas Partners, LP [Member] | Springfield Pipeline LLC [Member] | Series A Preferred Units [Member]      
Business Acquisition [Line Items]      
Units issued [2] 14,030,611    
Western Gas Partners, LP [Member] | Springfield Pipeline LLC [Member] | Springfield System [Member]      
Business Acquisition [Line Items]      
Percentage acquired 50.10%    
Western Gas Partners, LP [Member] | Springfield Pipeline LLC [Member] | Revolving Credit Facility [Member] | WES RCF [Member]      
Business Acquisition [Line Items]      
Borrowings [2] $ 247,500    
[1] WES acquired Delaware Basin JV Gathering LLC (“DBJV”) from Anadarko. DBJV owns a 50% interest in a gathering system and related facilities, such interest being referred to in this report as the “DBJV system”. The DBJV gathering system and related facilities are located in the Delaware Basin in Loving, Ward, Winkler and Reeves Counties, Texas. WES will make a cash payment on March 31, 2020, to Anadarko as consideration for the acquisition of DBJV. WES currently estimates the future payment will be $282.8 million, the net present value of which was $174.3 million as of the acquisition date. See DBJV acquisition—deferred purchase price obligation - Anadarko below.
[2] 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 system.” The Springfield oil and gas gathering systems 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 noted above to private investors (the “initial issuance”). See Note 4 for further information regarding the WES Series A Preferred units, including the full exercise of an option granted in connection with the initial issuance. WGP financed the purchase of the WES common units by borrowing $25.0 million on the WGP RCF. See Note 9.