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Transactions with Affiliates - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
May. 31, 2008
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Nov. 01, 2012
Related Party Transaction [Line Items]          
Note receivable - Anadarko   $ 260,000,000   $ 260,000,000 [1]  
Above-market component of swap extensions with Anadarko [2]   6,813,000      
Contributions of equity-based compensation to WES by Anadarko   $ 1,051,000      
Western Gas Equity Partners Long Term Incentive Plan [Member]          
Related Party Transaction [Line Items]          
Units vesting period   3 years      
Equity-based compensation expense   $ 56,000 $ 55,000    
Western Gas Partners, LP [Member] | Western Gas Equity Partners Long Term Incentive Plan [Member] | Anadarko Incentive Plans [Member]          
Related Party Transaction [Line Items]          
Equity-based compensation expense   1,200,000 1,000,000    
Contributions of equity-based compensation to WES by Anadarko   $ 1,100,000      
Western Gas Partners, LP [Member] | Western Gas Partners Long Term Incentive Plan [Member]          
Related Party Transaction [Line Items]          
Units vesting period   3 years      
Equity-based compensation expense   $ 100,000 $ 100,000    
Western Gas Partners, LP [Member] | Natural Gas [Member] | Gathering, Treating and Transportation [Member]          
Related Party Transaction [Line Items]          
Affiliate throughput percent   37.00% 56.00%    
Western Gas Partners, LP [Member] | Natural Gas [Member] | Processing [Member]          
Related Party Transaction [Line Items]          
Affiliate throughput percent   61.00% 52.00%    
Western Gas Partners, LP [Member] | Crude Oil and NGL [Member] | Gathering, Treating and Transportation [Member]          
Related Party Transaction [Line Items]          
Affiliate throughput percent   64.00% 100.00%    
Affiliates [Member] | Working Capital Facility [Member]          
Related Party Transaction [Line Items]          
Facility, maximum borrowing capacity         $ 30,000,000
Facility, expiration date   Nov. 01, 2017      
Affiliates [Member] | Working Capital Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Related Party Transaction [Line Items]          
Interest rate percent above LIBOR   1.50%      
Affiliates [Member] | Western Gas Partners, LP [Member]          
Related Party Transaction [Line Items]          
Note receivable - Anadarko $ 260,000,000 $ 260,000,000      
Note receivable, due date May 14, 2038        
Fixed annual rate for note receivable bearing interest 6.50%        
Affiliates [Member] | Western Gas Partners, LP [Member] | Level 2 Inputs [Member] | Market Approach Valuation Technique [Member]          
Related Party Transaction [Line Items]          
Fair value of the note receivable   $ 260,400,000   $ 252,300,000  
Independent Director [Member] | Western Gas Equity Partners Long Term Incentive Plan [Member]          
Related Party Transaction [Line Items]          
Units vesting period   1 year      
Independent Director [Member] | Western Gas Partners, LP [Member] | Western Gas Partners Long Term Incentive Plan [Member]          
Related Party Transaction [Line Items]          
Units vesting period   1 year      
[1] Financial information has been recast to include the financial position and results attributable to the Springfield system. See Note 1 and Note 2.
[2] See Note 5.