Commitments - Additional Information (Detail)	12 Months Ended									12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 Malaysia USD ($)	Dec. 31, 2011 Gulf of Mexico USD ($)	Dec. 31, 2011 Eagle Ford Shale USD ($)	Dec. 31, 2011 Brunei Offshore USD ($)	Dec. 31, 2011 Forecasted in 2012 cf	Dec. 31, 2011 Drilling Rigs And Associated Equipment USD ($)	Dec. 31, 2011 Processing Production Handling and Transportation Services USD ($)	Dec. 31, 2010 Processing Production Handling and Transportation Services USD ($)	Dec. 31, 2009 Processing Production Handling and Transportation Services USD ($)	Dec. 31, 2011 Crude Oil Storage Capacity USD ($)	Dec. 31, 2010 Crude Oil Storage Capacity USD ($)	Dec. 31, 2009 Crude Oil Storage Capacity USD ($)	Dec. 31, 2011 El Dorado Promise Annual Commitment from 2007 to 2016 USD ($)	Dec. 31, 2010 El Dorado Promise Annual Commitment from 2007 to 2016 USD ($)	Dec. 31, 2009 El Dorado Promise Annual Commitment from 2007 to 2016 USD ($)	Dec. 31, 2006 El Dorado Promise Annual Commitment from 2007 to 2016 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Natural gas deliveries contract, million cubic feet per day								50,000,000
Natural gas deliveries contract, price per thousand cubic feet, in Canadian dollars								4.43
Operating lease rental payments due in 2012	$ 161,752,000									$ 23,823,000			$ 1,000,000
Operating lease rental payments due in 2013	138,121,000									18,146,000			1,000,000
Operating lease rental payments due in 2014	127,044,000									18,452,000			1,000,000
Operating lease rental payments due in 2015	115,708,000									16,676,000			1,000,000
Operating lease rental payments due in 2016	34,525,000									11,800,000			1,000,000
Total payments for crude oil storage capacity													918,000	3,202,000	2,743,000
Processing and transportation charges										24,791,000	10,337,000	11,860,000
Rental expenses for noncancellable lease, including contingent payments	185,016,000	178,410,000	124,693,000
Future commitments									515,292,000							5,000,000
Discounted liability, unconditional commitment																			38,700,000
Accretion costs																1,317,000	1,534,000	1,739,000
Commitments for capital expenditures	$ 1,849,100,000			$ 839,500,000	$ 149,700,000	$ 124,500,000	$ 127,500,000