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Analysis of Deferred Taxes (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Tax effect of temporary differences:
Oil and gas properties - full cost	$ (465,862)	$ (381,413)
Asset retirement obligations	175,788	153,281
Stock compensation	5,588	4,962
Hedges	(16,983)	(12,882)
Alternative minimum tax credit carryforward		5,358
Other	6,153	8,931
Deferred Tax Assets, Net, Total	$ (295,316)	$ (221,763)

- Definition

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

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- Definition

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

+ References+ Details