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	1.96	[1]
DJ Basin Complex [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price	13.10	[1]
DJ Basin Complex [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price	19.75	[1]
DJ Basin Complex [Member] | Normal butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price	18.99	[1]
DJ Basin Complex [Member] | Natural gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price	52.59	[1]
DJ Basin Complex [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price	52.59	[1]
DJ Basin Complex [Member] | Natural gas (per MMbtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price | $ / MMBTU	2.75	[1]
Hugoton System [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price	32.56	[1]
Hugoton System [Member] | Natural gas (per MMbtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity Market Price | $ / MMBTU	2.74	[1]
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.