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Asset Retirement Obligations - Reconciliation of Beginning and Ending Aggregate Carrying Amounts of Asset Retirement Obligations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Asset Retirement Obligation, Roll Forward Analysis
Asset retirement obligations at December 31, 2012			$ 498,410
Liability incurred upon acquiring and drilling wells			4,145		5,363
Revisions in estimated cash flows			(206)
Liability settled or disposed in current period(1)			(100,653)	[1]
Accretion	8,472	9,053	28,051		19,625
Asset retirement obligations at September 30, 2013	429,747		429,747
Less: current portion	71,446		71,446			118,504
Asset retirement obligations, net of current	$ 358,301		$ 358,301			$ 379,906
[1] Liability settled or disposed during the nine-month period ended September 30, 2013 includes $22.7 million for the settlement of a plugging and abandonment obligation associated with the Company’s Bullwinkle platform in the Gulf of Mexico and $15.2 million disposed in conjunction with the sale of the Permian Properties in February 2013. Additionally, $17.1 million and $21.3 million were spent in the East Breaks and West Delta regions, respectively, to decommission various platforms, pipeline and associated wells during the nine-month period ended September 30, 2013.

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

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-Section 50

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Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of asset retirement obligations incurred during the period.

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Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Accretion expense of asset retirement obligations related to oil and gas producing activities.

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