Transactions with Affiliates - Commodity Price Swap Agreements Extensions Table (Details) - Jun. 25, 2015		$ / bbl $ / MMBTU
DJ Basin Complex [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price	[1]	1.96
DJ Basin Complex [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price	[1]	13.10
DJ Basin Complex [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price	[1]	19.75
DJ Basin Complex [Member] | Normal butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price	[1]	18.99
DJ Basin Complex [Member] | Natural gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price	[1]	52.59
DJ Basin Complex [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price	[1]	52.59
DJ Basin Complex [Member] | Natural gas (per MMbtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price | $ / MMBTU	[1]	2.75
Hugoton System [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price	[1]	32.56
Hugoton System [Member] | Natural gas (per MMbtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price | $ / MMBTU	[1]	2.74
Western Gas Partners, LP [Member] | DJ Basin Complex [Member] | Ethane [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		18.41
Western Gas Partners, LP [Member] | DJ Basin Complex [Member] | Propane [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		47.08
Western Gas Partners, LP [Member] | DJ Basin Complex [Member] | Isobutane [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		62.09
Western Gas Partners, LP [Member] | DJ Basin Complex [Member] | Normal butane [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		54.62
Western Gas Partners, LP [Member] | DJ Basin Complex [Member] | Natural gasoline [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		72.88
Western Gas Partners, LP [Member] | DJ Basin Complex [Member] | Condensate [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		76.47
Western Gas Partners, LP [Member] | DJ Basin Complex [Member] | Natural gas (per MMbtu) [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price | $ / MMBTU		5.96
Western Gas Partners, LP [Member] | Hugoton System [Member] | Condensate [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		78.61
Western Gas Partners, LP [Member] | Hugoton System [Member] | Natural gas (per MMbtu) [Member] | Year 2015 [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price | $ / MMBTU		5.50

[1] Represents the New York Mercantile Exchange forward strip price as of June 25, 2015, adjusted for location, basis and, in the case of NGLs, transportation and fractionation costs.