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Property, Plant and Equipment - Additional Information (Detail) (USD $)
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Dec. 31, 2009
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]    
Total capitalized exploratory well costs$ 529,246,000$ 497,765,000$ 459,659,000$ 369,862,000
Exploratory well costs capitalized more than one year436,500,000   
Malaysia
    
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]    
Exploratory well costs capitalized more than one year273,100,000   
United States
    
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]    
Exploratory well costs capitalized more than one year137,500,000   
Republic of the Congo
    
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]    
Exploratory well costs capitalized more than one year15,300,000   
Canada
    
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]    
Exploratory well costs capitalized more than one year$ 10,600,000