Assets and Liabilities Held for Sale Related to the Meraux Refinery and Associated Assets (Detail) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current Assets:
Accounts receivable	$ 1,780,976	$ 1,467,311
Total current assets	4,460,630	3,550,693
Noncurrent Assets:
Property, plant and equipment - net, at realizable value	10,338,783	10,367,847
Other	184,606	271,853
Meraux, Louisiana Refinery
Current Assets:
Accounts receivable	1,243
Liquid inventories	51,268
Materials and supplies inventories	23,076
Other	3,092
Total current assets	78,679
Noncurrent Assets:
Property, plant and equipment - net, at realizable value	428,804
Other	37,543
Assets, Noncurrent, Total	$ 466,347