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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
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 on divestiture and other, net [1]               57,020 0 [2] $ 0 [2]  
Other assets               29,707 28,289 [3]    
Long-term debt               $ 2,707,357 2,422,954 [3]    
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 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] | 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] Includes losses related to an incident at the DBM complex for the year ended December 31, 2015. See Note 1.
[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] Financial information has been recast to include the financial position and results attributable to the DBJV system. 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.