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Acquisitions and Divestitures - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Mar. 02, 2015
Dec. 31, 2014
 [2]
Property, Plant and Equipment [Line Items]        
Deferred purchase price obligation - Anadarko [1] $ 179,886 $ 179,886   $ 0
Western Gas Partners, LP [Member] | Delaware Basin Midstream LLC [Member]        
Property, Plant and Equipment [Line Items]        
Post-closing purchase price adjustments   3,500    
Western Gas Partners, LP [Member] | Dew and Pinnacle Systems [Member] | Assets Held for Sale [Member]        
Property, Plant and Equipment [Line Items]        
Current assets - held for sale 2,200 2,200    
Long-term assets - held for sale 71,900 71,900    
Current liabilities - held for sale 4,200 4,200    
Long-term liabilities - held for sale 3,000 $ 3,000    
Western Gas Partners, LP [Member] | Deferred Purchase Price Obligation - Anadarko [Member] | Delaware Basin JV Gathering LLC [Member]        
Property, Plant and Equipment [Line Items]        
Deferred purchase price obligation to Anadarko - future value     $ 282,800  
Deferred purchase price obligation to Anadarko - acquisition date value [3]     $ 174,276  
Discount rate percentage   10.00%    
Deferred purchase price obligation - Anadarko 179,900 $ 179,900    
Interest expense, related party $ 4,200 $ 5,600    
[1] See Note 2.
[2] Financial information has been recast to include the financial position and results attributable to the DBJV system. See Note 1 and Note 2.
[3] WES acquired Anadarko’s interest in Delaware Basin JV Gathering LLC (“DBJV”), which owns a 50% interest in a gathering system and related facilities (the “DBJV system”). The DBJV system is 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.