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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 $ 1,506,135 $ 1,162,749
Net income (loss) 346,550 239,913
Net income (loss) attributable to Western Gas Equity Partners, LP $ 181,082 $ 134,080
Net income (loss) per common unit - basic and diluted $ 0.75 $ 0.57