Discontinued Operations - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 12, 2009	Sep. 30, 2011	Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of assets			$ 27,776,000	$ 2,189,000	[1]	$ 1,616,000	[1]
Number of Refineries for disposal		2
Gain (loss) on disposal of refineries, net of tax		18,724,000
Net cash proceeds from operations sold in Ecuador	78,900,000
Gain from the sale of the Ecuador properties, net of income taxes	103,596,000
Gain from the sale of the Ecuador properties, income taxes	13,961,000
Superior Refinery
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of assets		214,000,000
Gain (loss) on disposal of refineries, net of tax		77,585,000
Meraux Refinery
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of assets		325,000,000
Gain (loss) on disposal of refineries, net of tax		(58,861,000)
Gain (loss) on liquidation of inventories		$ 179,152,000

[1] Reclassified to conform to current presentation.