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Debt and Interest Expense - Debt Activity Table (details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Western Gas Partners [Member]	Mar. 31, 2013 Revolving Credit Facility [Member] Western Gas Partners [Member]
Debt Instrument Line Items
Balance	$ 1,553,319	$ 1,168,278
Borrowings				385,000
Other and changes in debt discount or premium			41
Balance	$ 1,553,319	$ 1,168,278		$ 385,000

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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