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Reconciliation of The Provision For Incom Taxes (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Provision For Income Taxes Reconciliation [Line Items]
Statutory tax rate	34.00%	34.00%
Derivative instruments	(94.80%)	7.80%
Oil costs and long-lived assets	30.70%	(0.30%)
Non-deductible expenses	14.90%	(5.10%)
Change in valuation allowance	15.20%	(36.40%)
Effective tax rate	0.00%	0.00%

X

- Definition

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the derivative instruments.

+ References

No definition available.

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- Definition

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to the oil costs and long-lived assets.

+ References

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

+ References

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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-Publisher FASB

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to changes in the valuation allowance for deferred tax assets.

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The sum of the differences between the effective income tax rate and domestic federal statutory income tax rate attributable to all nondeductible expenses under enacted tax laws.

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