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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 24, 2016
Mar. 02, 2015
[6]
Mar. 08, 2013
[5]
Mar. 01, 2013
[4]
Nov. 30, 2014
Aug. 31, 2012
Jul. 31, 2009
Dec. 31, 2008
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 01, 2016
Imbalance receivables                 $ 2,122 $ 415    
Imbalance payables                 1,600 700    
Gain (loss) on divestiture and other, net [1],[2]                 57,024 (9) $ 0  
Other assets [3]                 29,707 28,289    
Long-term debt [3]                 $ 2,707,357 2,422,954    
Restatement Adjustment [Member] | Accounting Standards Update 2015-03 And 2015-15 [Member] | Subsequent Event [Member]                        
Other assets                       $ 16,700
Long-term debt                       $ 16,700
Western Gas Equity Partners Long Term Incentive Plan [Member]                        
Units authorized under LTIP                 3,000,000      
Units available under LTIP                 2,955,746      
Chipeta Processing Limited Liability Company [Member]                        
Ownership interest by noncontrolling owner                 25.00%      
Western Gas Partners, LP [Member]                        
General partner's interest         2.00%       1.80%      
Marginal percentage interest in distributions                 48.00%      
Western Gas Partners, LP [Member] | Western Gas Partners Long Term Incentive Plan [Member]                        
Units authorized under LTIP                 2,250,000      
Units available under LTIP                 2,128,015      
Western Gas Partners, LP [Member] | Delaware Basin Midstream Complex [Member]                        
Gain (loss) on divestiture and other, net                 $ 20,300      
Insurance receivable                 $ 48,500      
Western Gas Partners, LP [Member] | Other Subsidiaries Of Anadarko [Member]                        
Common units issued                 757,619      
Western Gas Partners, LP [Member] | Operating Income (Loss) [Member] | Restatement Adjustment [Member]                        
Correction of an immaterial error                 $ 25,000 $ 39,300 $ 20,500  
Western Gas Partners, LP [Member] | Non-Operated Marcellus Interest [Member]                        
Ownership interest       33.75%         33.75%      
Western Gas Partners, LP [Member] | Anadarko-Operated Marcellus Interest [Member]                        
Ownership interest     33.75%           33.75%      
Western Gas Partners, LP [Member] | Newcastle [Member]                        
Ownership interest               50.00% 50.00%      
Western Gas Partners, LP [Member] | Springfield Pipeline LLC [Member]                        
Ownership interest                 50.10%      
Western Gas Partners, LP [Member] | Springfield Pipeline LLC [Member] | Subsequent Event [Member]                        
Ownership interest 100.00%                      
Western Gas Partners, LP [Member] | Delaware Basin JV Gathering LLC [Member]                        
Ownership interest   50.00%             50.00%      
Western Gas Partners, LP [Member] | Chipeta Processing Limited Liability Company [Member]                        
Ownership interest           24.00% 51.00%   75.00%      
Western Gas Partners, LP [Member] | Incentive Distribution Rights [Member]                        
General partner's interest                 100.00%      
Western Gas Partners, LP [Member] | General Partner [Member]                        
Ownership interest                 100.00%      
Western Gas Partners, LP [Member] | Fort Union [Member]                        
Equity investment ownership                 14.81%      
Western Gas Partners, LP [Member] | Rendezvous [Member]                        
Equity investment ownership                 22.00%      
Western Gas Partners, LP [Member] | White Cliffs [Member]                        
Equity investment ownership                 10.00%      
Western Gas Partners, LP [Member] | Mont Belvieu JV [Member]                        
Equity investment ownership                 25.00%      
Western Gas Partners, LP [Member] | Texas Express Pipeline LLC [Member]                        
Equity investment ownership                 20.00%      
Western Gas Partners, LP [Member] | Texas Express Gathering LLC [Member]                        
Equity investment ownership                 20.00%      
Western Gas Partners, LP [Member] | Front Range Pipeline LLC [Member]                        
Equity investment ownership                 33.33%      
[1] Financial information for the year ended December 31, 2015, has been recast to include the financial position and results attributable to the Springfield system, and the financial information for the years ended December 31, 2014 and 2013, has been recast to include the financial position and results attributable to the Springfield and DBJV systems. See Note 1 and Note 2.
[2] Includes losses related to an incident at the DBM complex for the year ended December 31, 2015. See Note 1.
[3] Financial information as of December 31, 2015, has been recast to include the financial position and results attributable to the Springfield system, and the financial information as of December 31, 2014, has been recast to include the financial position and results attributable to the Springfield and DBJV systems. See Note 1 and Note 2.
[4] WES acquired Anadarko’s 33.75% interest (non-operated) (the “Non-Operated Marcellus Interest”) in the Liberty and Rome gas gathering systems (the “Non-Operated Marcellus Interest systems”), serving production from the Marcellus shale in North-central Pennsylvania. In connection with the issuance of WES common units, WES GP purchased 9,166 general partner units for consideration of $0.5 million.
[5] WES acquired a 33.75% interest (the “Anadarko-Operated Marcellus Interest”) in each of the Larry’s Creek, Seely and Warrensville gas gathering systems (the “Anadarko-Operated Marcellus Interest systems”), which are operated by Anadarko and serve production from the Marcellus shale in North-central Pennsylvania, from a third party. During the third quarter of 2013, WES recorded a $1.1 million decrease in the assets acquired and liabilities assumed in the acquisition, representing the final purchase price allocation.
[6] 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.