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Acquisitions and Divestitures - Pro Forma Condensed Financial Information Table (Details) - Delaware Basin Midstream LLC [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]    
Revenues and other $ 1,656,644 $ 1,277,327
Net income (loss) 395,351 238,618
Net income (loss) attributable to Western Gas Equity Partners, LP $ 229,883 $ 132,785
Net income (loss) per common unit - basic and diluted $ 0.75 $ 0.57