Property, Plant and Equipment - Additional Information (details) (USD $)				3 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013		Mar. 31, 2014 Western Gas Partners [Member]	Jun. 30, 2014 Western Gas Partners [Member] Natural Gas Processing Plant [Member]	Sep. 30, 2014 Western Gas Partners [Member] Non-Operated Marcellus Interest [Member]	Sep. 30, 2014 Western Gas Partners [Member] Non-Operated Marcellus Interest [Member]	Sep. 30, 2014 Western Gas Partners [Member] Hilight System [Member]	Mar. 31, 2014 Western Gas Partners [Member] Equipment [Member]
Property, Plant and Equipment [Line Items]
Unguaranteed residual value		$ 4,600,000
Property, plant and equipment	4,754,279,000	4,239,100,000	[1]		4,600,000
Impairment				1,200,000		400,000	700,000	500,000
Estimated fair value									$ 2,400,000

[1] Financial information has been recast to include the financial position and results attributable to the TEFR Interests. See Note 1 and Note 2.