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Transactions with Affiliates - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 01, 2012
May 31, 2008
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Related Party Transaction [Line Items]              
Note receivable - Anadarko     $ 260,000,000   $ 260,000,000   $ 260,000,000 [1]
Above-market component of swap extensions with Anadarko [2]         34,782,000    
Contributions of equity-based compensation to WES by Anadarko         $ 3,026,000    
Western Gas Equity Partners Long Term Incentive Plan [Member]              
Related Party Transaction [Line Items]              
Units vesting period         3 years    
Equity-based compensation expense     57,000 $ 56,000 $ 200,000 $ 200,000  
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%            
Independent Director [Member] | Western Gas Equity Partners Long Term Incentive Plan [Member]              
Related Party Transaction [Line Items]              
Units vesting period         1 year    
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     1,400,000 1,000,000 $ 3,700,000 3,100,000  
Contributions of equity-based compensation to WES by Anadarko         $ 3,100,000    
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 $ 300,000 $ 400,000  
Western Gas Partners, LP [Member] | Natural Gas [Member] | Gathering, Treating and Transportation [Member]              
Related Party Transaction [Line Items]              
Affiliate throughput percent     37.00% 53.00% 38.00% 55.00%  
Western Gas Partners, LP [Member] | Natural Gas [Member] | Processing [Member]              
Related Party Transaction [Line Items]              
Affiliate throughput percent     51.00% 47.00% 55.00% 51.00%  
Western Gas Partners, LP [Member] | Crude Oil and NGL [Member] | Gathering, Treating and Transportation [Member]              
Related Party Transaction [Line Items]              
Affiliate throughput percent     67.00% 100.00% 64.00% 100.00%  
Western Gas Partners, LP [Member] | Affiliates [Member]              
Related Party Transaction [Line Items]              
Note receivable - Anadarko   $ 260,000,000 $ 260,000,000   $ 260,000,000    
Note receivable, due date   May 14, 2038          
Fixed annual rate for note receivable bearing interest   6.50%          
Western Gas Partners, LP [Member] | Affiliates [Member] | Level 2 Inputs [Member] | Market Approach Valuation Technique [Member]              
Related Party Transaction [Line Items]              
Fair value of the note receivable     $ 308,100,000   $ 308,100,000   $ 252,300,000
Western Gas Partners, LP [Member] | Independent Director [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 interest. See Note 1 and Note 2.
[2] See Note 5.