Acquisitions - Impact to Historical Consolidated Statement of Income Table (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Revenues	$ 326,465		$ 273,502	[1]	$ 935,866		$ 750,670	[1]
Equity income, net	19,063	[2],[3]	4,520	[1],[2],[3]	41,322	[2],[3],[4]	11,944	[1],[2],[3],[4]
Net income (loss)	105,784		81,223	[1]	293,705		193,905	[1]
Texas Express And Front Range [Member]
Revenues			0				0
Equity income, net			21				(260)
Net income (loss)			106				(21)
WGP Historical [Member]
Revenues			273,502				750,670
Equity income, net			4,499				12,204
Net income (loss)			$ 81,117				$ 193,926

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

[2] Income earned from equity investments is classified as affiliate. See Note 1.

[3] Represents amounts earned or incurred on and subsequent to the date of acquisition of WES assets, as well as amounts earned or incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

[4] Income earned on, distributions from and contributions to equity investments are classified as affiliate. See Note 1.