Commitments and Contingencies - Schedule of Future Minimum Firm Transportation and Gathering Contracts (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Contingencies And Commitments [Line Items]
2012 (remaining)	$ 35,581
2013	145,981
2014	143,925
2015	153,468
2016	155,828
Thereafter	861,431
Transportation Commitments Future Minimum Transportation Fees Due, Total	$ 1,496,214

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