Analysis of Deferred Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Tax effect of temporary differences:
Net operating loss carryforwards	$ 24,437
Oil and gas properties - full cost	(576,393)	(465,862)
Asset retirement obligations	180,905	175,788
Stock compensation	5,537	5,588
Hedges	826	(16,983)
Accrued incentive compensation	9,189	4,762
Other	3,484	1,391
Deferred Tax Assets, Net, Total	$ (358,983)	$ (295,316)

Deferred Tax Assets Accrued Compensation

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Deferred tax assets asset retirement obligations.

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Deferred Tax Assets Liabilities Derivatives

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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