Acquisitions and Divestitures - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Mar. 02, 2015
Property, Plant and Equipment [Line Items]
Deferred purchase price obligation - Anadarko, present value	[1]	$ 41,440	$ 188,674
Western Gas Partners, LP [Member] | Hugoton System [Member]
Property, Plant and Equipment [Line Items]
Gain (loss) on sale of assets		(12,000)
Goodwill allocated to divestiture		1,600
Western Gas Partners, LP [Member] | Dew And Pinnacle Systems [Member]
Property, Plant and Equipment [Line Items]
Gain (loss) on sale of assets			77,300
Goodwill allocated to divestiture			5,100
Western Gas Partners, LP [Member] | Delaware Basin JV Gathering LLC [Member] | Deferred Purchase Price Obligation - Anadarko [Member]
Property, Plant and Equipment [Line Items]
Deferred purchase price obligation - Anadarko, future value		56,455	282,807	$ 282,807
Deferred purchase price obligation - Anadarko, present value		$ 41,440	$ 188,674	$ 174,276	[2]
Discount rate percentage		10.00%
Deferred purchase price obligation to Anadarko - future value change		$ 226,400

[1] See Note 2.

[2] WES acquired Delaware Basin JV Gathering LLC (“DBJV”) from Anadarko. DBJV owns a 50% interest in a gathering system and related facilities. The DBJV gathering system and related facilities (the “DBJV system”) are 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. At the acquisition date, WES estimated the future payment would be $282.8 million, the net present value of which was $174.3 million. For further information, including revisions to the estimated future payment, see DBJV acquisition—deferred purchase price obligation - Anadarko below.