Firm Transportation Contracts and Throughput Agreements (Detail) (Transportation and Throughput Agreements, USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Transportation and Throughput Agreements
Commitments and Contingencies Disclosure [Line Items]
2012	$ 31,723
2013	26,061
2014	17,976
2015	11,315
2016	11,346
Thereafter	30,163
Total future obligation	$ 128,584

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Contractual commitments future minimum payments due total.

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Contractual Commitments Future Minimum Payments Due In Five Years

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