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Bluestone Acquisition (Details) (USD $)	12 Months Ended				1 Months Ended
Bluestone Acquisition (Details) (USD $)	Dec. 31, 2010	Dec. 31, 2011 BEP	Dec. 02, 2010 BEP item acre	Dec. 02, 2010 BEP Level 3 inputs	Dec. 31, 2012 BEP Class I-5 units	Dec. 31, 2012 BEP Class B-6 units
Bluestone Acquisition
Percentage of interest acquired			100.00%
Number of producing wells			96
Area of unproved leaseholds (in acres)			37,250
Consideration:
Cash			$ 96,200,000
I-5 and B-6 units in Antero Resources LLC			97,000,000
Total fair value of consideration transferred			193,200,000
Units issued					3,814,392	3,814,392
Acquisition related costs	2,544,000	2,500,000
Fair values of identifiable assets acquired and liabilities assumed:
Current assets			17,200,000
Property, plant, and equipment
Producing properties	50,700,000			50,700,000
Undeveloped leases	206,300,000			206,300,000
Other				4,300,000
Other long-term assets				9,300,000
Current liabilities			(7,000,000)
Long term liabilities			(26,200,000)
Deferred tax liabilities			(61,400,000)
Net assets acquired			193,200,000
Estimated fair value of the units issued				$ 97,000,000

The amount of acquisition cost of a business combination allocated to other property, plant and equipment to be used in ongoing operations.

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The amount of acquisition cost of a business combination allocated to producing properties to be used in ongoing operations.

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The amount of acquisition cost of a business combination allocated to undeveloped leases to be used in ongoing operations.

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The total number of producing oil and gas wells capable of production, in which the entity owns an undivided working interest.

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Amount of cash paid to acquire the entity.

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The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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Number of shares of equity interests issued or issuable to acquire entity.

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Percentage of voting equity interests acquired in the business combination.

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The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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The amount of acquisition cost of a business combination allocated to current assets.

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Gross amount of acquisition cost of a business combination allocated to noncurrent deferred tax liabilities.

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Amount of acquisition cost of a business combination allocated to other noncurrent assets not separately disclosed.

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Amount of acquisition cost of a business combination allocated to other noncurrent liabilities not separately disclosed.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Lease area in which a working interest is owned and on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves.

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