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Costs Incurred in Certain Oil and Gas Activities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Information on Oil and Gas Producing Activities [Abstract]
Proved property acquisition costs	$ 0	$ 0	$ 5,671
Unproved property acquisition costs	27,775	47,877	133,185
Exploration costs	50,883	77,460	66,886
Development costs and other	305,693	320,263	244,092
Total costs incurred	$ 384,351	$ 445,600	$ 449,834

- Definition

Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves.

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- Definition

Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

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- Definition

Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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- Definition

Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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