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Description of Business and Basis of Presentation - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
May 31, 2008
Note receivable - Anadarko $ 260,000,000     $ 260,000,000  
Loss on divestiture and other, net [1],[2] (116,000) $ (119,487,000)      
Proceeds from property insurance claims 0 24,000,000      
Cumulative effect of accounting change [3] $ (44,409,000)        
Contract term        
Accounting Standards Update 2014-09 [Member]          
Cumulative effect of accounting change     $ (44,409,000)    
Chipeta [Member]          
Ownership interest by noncontrolling interest owner 25.00%        
Western Gas Equity Partners, LP [Member] | Western Gas Partners, LP [Member] | General Partner [Member]          
Percentage ownership interest 100.00%        
Western Gas Partners, LP [Member] | Minimum [Member]          
Contract term 5 years        
Western Gas Partners, LP [Member] | Maximum [Member]          
Contract term 10 years        
Western Gas Partners, LP [Member] | Delaware Basin Midstream Complex [Member]          
Loss on divestiture and other, net   5,700,000      
Proceeds from insurance claims, total   29,800,000      
Proceeds from business interruption insurance claims   5,767,000      
Proceeds from property insurance claims   $ 24,000,000      
Western Gas Partners, LP [Member] | Affiliates [Member]          
Note receivable - Anadarko $ 260,000,000       $ 260,000,000
Western Gas Partners, LP [Member] | Other Subsidiaries of Anadarko [Member]          
WES common units issued 2,011,380        
[1] Includes losses related to an incident at the DBM complex for the three months ended March 31, 2017. See Note 1.
[2] Includes losses related to an incident at the DBM complex for the three months ended March 31, 2017. See Note 1.
[3] See Note 1.