Commitments and Contingencies - Schedule of Future Minimum Transportation and Gathering Fees (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Contingencies And Commitments [Line Items]
2013	$ 184,802
2014	177,027
2015	182,884
2016	185,709
2017	181,995
Thereafter	825,717
Transportation and Gathering Contracts	$ 1,738,134

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