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Results of Operations for Oil and Gas Producing Activities (Detail) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues      
Total oil and gas revenues $ 4,312,100,000 [1] $ 3,671,700,000 [1] $ 2,787,500,000 [1]
Other operating revenues 40,500,000 [1] 18,400,000 [1] 248,500,000 [1],[2]
Total revenues 4,352,600,000 [1] 3,690,100,000 [1] 3,036,000,000 [1]
Costs and expenses      
Production expenses 1,038,600,000 [1] 879,500,000 [1] 654,500,000 [1]
Exploration costs charged to expense 371,700,000 [1] 184,300,000 [1] 182,000,000 [1]
Undeveloped lease amortization 118,200,000 [1] 108,000,000 [1] 83,200,000 [1]
Depreciation, depletion and amortization 969,700,000 [1] 1,005,000,000 [1] 775,800,000 [1]
Accretion of asset retirement obligations 36,800,000 [1] 31,100,000 [1] 25,500,000 [1]
Impairment of properties 368,600,000 [1]   5,200,000 [1]
Terra Nova working interest redetermination (5,351,000) [1] 18,582,000 [1],[3] 83,498,000 [1],[3]
Selling and general expenses 101,100,000 [1] 79,800,000 [1] 58,400,000 [1]
Total costs and expenses 2,999,300,000 [1] 2,306,300,000 [1] 1,868,100,000 [1]
Results of Operations, Income before Income Taxes 1,353,300,000 [1] 1,383,800,000 [1] 1,167,900,000 [1]
Income tax expense (benefits) 727,600,000 [1] 576,900,000 [1] 476,100,000 [1]
Results of operations 625,700,000 [1] 806,900,000 [1] 691,800,000 [1]
Crude Oil and Natural Gas Liquids
      
Revenues      
Sales to unaffiliated enterprises 3,342,400,000 [1] 3,012,500,000 [1] 2,501,200,000 [1]
Transfers to consolidated operations 142,800,000 [1] 118,900,000 [1] 85,300,000 [1]
Natural Gas
      
Revenues      
Sales to unaffiliated enterprises 826,900,000 [1] 540,300,000 [1] 201,000,000 [1]
United States
      
Costs and expenses      
Exploration costs charged to expense 36,500,000 35,700,000 27,500,000
United States | Oil Reserves
      
Revenues      
Total oil and gas revenues 719,900,000 [1] 644,600,000 [1] 455,400,000 [1]
Other operating revenues 17,800,000 [1] 15,300,000 [1] 253,200,000 [1],[2]
Total revenues 737,700,000 [1] 659,900,000 [1] 708,600,000 [1]
Costs and expenses      
Production expenses 164,800,000 [1] 131,700,000 [1] 101,200,000 [1]
Exploration costs charged to expense 36,500,000 [1] 35,700,000 [1] 27,500,000 [1]
Undeveloped lease amortization 62,200,000 [1] 68,500,000 [1] 34,700,000 [1]
Depreciation, depletion and amortization 183,000,000 [1] 281,100,000 [1] 246,500,000 [1]
Accretion of asset retirement obligations 9,900,000 [1] 6,900,000 [1] 6,800,000 [1]
Impairment of properties 0 [1]   5,200,000 [1]
Terra Nova working interest redetermination 0 [1] 0 [1] 0 [1]
Selling and general expenses 42,100,000 [1] 33,300,000 [1] 20,300,000 [1]
Total costs and expenses 498,500,000 [1] 557,200,000 [1] 442,200,000 [1]
Results of Operations, Income before Income Taxes 239,200,000 [1] 102,700,000 [1] 266,400,000 [1]
Income tax expense (benefits) 86,500,000 [1] 30,000,000 [1] 88,400,000 [1]
Results of operations 152,700,000 [1] 72,700,000 [1] 178,000,000 [1]
United States | Crude Oil and Natural Gas Liquids | Oil Reserves
      
Revenues      
Sales to unaffiliated enterprises 648,800,000 [1] 557,600,000 [1] 374,800,000 [1]
Transfers to consolidated operations 0 [1] 0 [1] 0 [1]
United States | Natural Gas | Oil Reserves
      
Revenues      
Sales to unaffiliated enterprises 71,100,000 [1] 87,000,000 [1] 80,600,000 [1]
Canada
      
Costs and expenses      
Exploration costs charged to expense 60,800,000 1,900,000 10,000,000
Canada | Conventional
      
Revenues      
Total oil and gas revenues 785,800,000 [1] 520,700,000 [1] 434,200,000 [1]
Other operating revenues (3,800,000) [1] (200,000) [1] (2,200,000) [1],[2]
Total revenues 782,000,000 [1] 520,500,000 [1] 432,000,000 [1]
Costs and expenses      
Production expenses 151,200,000 [1] 97,500,000 [1] 97,900,000 [1]
Exploration costs charged to expense 60,800,000 [1] 1,900,000 [1] 10,000,000 [1]
Undeveloped lease amortization 28,800,000 [1] 33,700,000 [1] 44,100,000 [1]
Depreciation, depletion and amortization 273,900,000 [1] 180,300,000 [1] 171,800,000 [1]
Accretion of asset retirement obligations 4,900,000 [1] 4,800,000 [1] 4,300,000 [1]
Impairment of properties 0 [1]   0 [1]
Terra Nova working interest redetermination (5,400,000) [1] 18,600,000 [1] 83,500,000 [1]
Selling and general expenses 14,200,000 [1] 10,500,000 [1] 18,000,000 [1]
Total costs and expenses 528,400,000 [1] 347,300,000 [1] 429,600,000 [1]
Results of Operations, Income before Income Taxes 253,600,000 [1] 173,200,000 [1] 2,400,000 [1]
Income tax expense (benefits) 79,700,000 [1] 44,600,000 [1] 1,200,000 [1]
Results of operations 173,900,000 [1] 128,600,000 [1] 1,200,000 [1]
Canada | Synthetic Oil
      
Revenues      
Total oil and gas revenues 506,600,000 [1] 378,600,000 [1] 288,500,000 [1]
Other operating revenues 0 [1] 0 [1] 0 [1],[2]
Total revenues 506,600,000 [1] 378,600,000 [1] 288,500,000 [1]
Costs and expenses      
Production expenses 236,100,000 [1] 206,400,000 [1] 171,900,000 [1]
Exploration costs charged to expense 0 [1] 0 [1] 0 [1]
Undeveloped lease amortization 0 [1] 0 [1] 0 [1]
Depreciation, depletion and amortization 52,100,000 [1] 45,200,000 [1] 28,100,000 [1]
Accretion of asset retirement obligations 7,600,000 [1] 6,400,000 [1] 4,300,000 [1]
Impairment of properties 0 [1]   0 [1]
Terra Nova working interest redetermination 0 [1] 0 [1] 0 [1]
Selling and general expenses 900,000 [1] 900,000 [1] 800,000 [1]
Total costs and expenses 296,700,000 [1] 258,900,000 [1] 205,100,000 [1]
Results of Operations, Income before Income Taxes 209,900,000 [1] 119,700,000 [1] 83,400,000 [1]
Income tax expense (benefits) 55,800,000 [1] 34,500,000 [1] 19,800,000 [1]
Results of operations 154,100,000 [1] 85,200,000 [1] 63,600,000 [1]
Canada | Crude Oil and Natural Gas Liquids | Conventional
      
Revenues      
Sales to unaffiliated enterprises 459,200,000 [1] 346,400,000 [1] 310,700,000 [1]
Transfers to consolidated operations 46,400,000 [1] 42,200,000 [1] 54,900,000 [1]
Canada | Crude Oil and Natural Gas Liquids | Synthetic Oil
      
Revenues      
Sales to unaffiliated enterprises 410,200,000 [1] 301,900,000 [1] 258,100,000 [1]
Transfers to consolidated operations 96,400,000 [1] 76,700,000 [1] 30,400,000 [1]
Canada | Natural Gas | Conventional
      
Revenues      
Sales to unaffiliated enterprises 280,200,000 [1] 132,100,000 [1] 68,600,000 [1]
Canada | Natural Gas | Synthetic Oil
      
Revenues      
Sales to unaffiliated enterprises 0 [1] 0 [1] 0 [1]
Malaysia
      
Costs and expenses      
Exploration costs charged to expense 11,100,000 19,800,000 55,800,000
Malaysia | Oil Reserves
      
Revenues      
Total oil and gas revenues 2,044,300,000 [1] 1,838,200,000 [1] 1,523,800,000 [1]
Other operating revenues 1,300,000 [1] (300,000) [1] 2,600,000 [1],[2]
Total revenues 2,045,600,000 [1] 1,837,900,000 [1] 1,526,400,000 [1]
Costs and expenses      
Production expenses 420,600,000 [1] 355,000,000 [1] 248,200,000 [1]
Exploration costs charged to expense 11,100,000 [1] 19,800,000 [1] 55,800,000 [1]
Undeveloped lease amortization 0 [1] 0 [1] 0 [1]
Depreciation, depletion and amortization 357,300,000 [1] 379,000,000 [1] 304,100,000 [1]
Accretion of asset retirement obligations 10,600,000 [1] 9,800,000 [1] 7,800,000 [1]
Impairment of properties 0 [1]   0 [1]
Terra Nova working interest redetermination 0 [1] 0 [1] 0 [1]
Selling and general expenses (1,600,000) [1] 800,000 [1] (5,500,000) [1]
Total costs and expenses 798,000,000 [1] 764,400,000 [1] 610,400,000 [1]
Results of Operations, Income before Income Taxes 1,247,600,000 [1] 1,073,500,000 [1] 916,000,000 [1]
Income tax expense (benefits) 434,900,000 [1] 414,100,000 [1] 354,100,000 [1]
Results of operations 812,700,000 [1] 659,400,000 [1] 561,900,000 [1]
Malaysia | Crude Oil and Natural Gas Liquids | Oil Reserves
      
Revenues      
Sales to unaffiliated enterprises 1,583,000,000 [1] 1,531,100,000 [1] 1,478,400,000 [1]
Transfers to consolidated operations 0 [1] 0 [1] 0 [1]
Malaysia | Natural Gas | Oil Reserves
      
Revenues      
Sales to unaffiliated enterprises 461,300,000 [1] 307,100,000 [1] 45,400,000 [1]
United Kingdom
      
Costs and expenses      
Exploration costs charged to expense 500,000 16,200,000 200,000
United Kingdom | Oil Reserves
      
Revenues      
Total oil and gas revenues 106,700,000 [1] 132,900,000 [1] 61,100,000 [1]
Other operating revenues 600,000 [1] 700,000 [1] 500,000 [1],[2]
Total revenues 107,300,000 [1] 133,600,000 [1] 61,600,000 [1]
Costs and expenses      
Production expenses 28,300,000 [1] 26,900,000 [1] 19,900,000 [1]
Exploration costs charged to expense 500,000 [1] 16,200,000 [1] 200,000 [1]
Undeveloped lease amortization 0 [1] 0 [1] 0 [1]
Depreciation, depletion and amortization 13,700,000 [1] 22,400,000 [1] 12,400,000 [1]
Accretion of asset retirement obligations 3,000,000 [1] 2,300,000 [1] 1,600,000 [1]
Impairment of properties 0 [1]   0 [1]
Terra Nova working interest redetermination 0 [1] 0 [1] 0 [1]
Selling and general expenses 3,500,000 [1] 2,700,000 [1] 3,000,000 [1]
Total costs and expenses 49,000,000 [1] 70,500,000 [1] 37,100,000 [1]
Results of Operations, Income before Income Taxes 58,300,000 [1] 63,100,000 [1] 24,500,000 [1]
Income tax expense (benefits) 46,800,000 [1] 32,600,000 [1] 11,900,000 [1]
Results of operations 11,500,000 [1] 30,500,000 [1] 12,600,000 [1]
United Kingdom | Crude Oil and Natural Gas Liquids | Oil Reserves
      
Revenues      
Sales to unaffiliated enterprises 92,400,000 [1] 118,800,000 [1] 54,700,000 [1]
Transfers to consolidated operations 0 [1] 0 [1] 0 [1]
United Kingdom | Natural Gas | Oil Reserves
      
Revenues      
Sales to unaffiliated enterprises 14,300,000 [1] 14,100,000 [1] 6,400,000 [1]
Republic of the Congo
      
Costs and expenses      
Exploration costs charged to expense 21,000,000 56,400,000 10,800,000
Republic of the Congo | Oil Reserves
      
Revenues      
Total oil and gas revenues 148,800,000 [1] 156,700,000 [1] 24,500,000 [1]
Other operating revenues 0 [1] (1,000,000) [1] (8,000,000) [1],[2]
Total revenues 148,800,000 [1] 155,700,000 [1] 16,500,000 [1]
Costs and expenses      
Production expenses 37,600,000 [1] 62,000,000 [1] 15,400,000 [1]
Exploration costs charged to expense 21,000,000 [1] 56,400,000 [1] 10,800,000 [1]
Undeveloped lease amortization 0 [1] 0 [1] 0 [1]
Depreciation, depletion and amortization 87,800,000 [1] 95,500,000 [1] 11,500,000 [1]
Accretion of asset retirement obligations 500,000 [1] 400,000 [1] 100,000 [1]
Impairment of properties 368,600,000 [1]   0 [1]
Terra Nova working interest redetermination 0 [1] 0 [1] 0 [1]
Selling and general expenses 2,200,000 [1] (2,000,000) [1] (2,000,000) [1]
Total costs and expenses 517,700,000 [1] 212,300,000 [1] 35,800,000 [1]
Results of Operations, Income before Income Taxes (368,900,000) [1] (56,600,000) [1] (19,300,000) [1]
Income tax expense (benefits) 16,400,000 [1] 20,600,000 [1] 1,300,000 [1]
Results of operations (385,300,000) [1] (77,200,000) [1] (20,600,000) [1]
Republic of the Congo | Crude Oil and Natural Gas Liquids | Oil Reserves
      
Revenues      
Sales to unaffiliated enterprises 148,800,000 [1] 156,700,000 [1] 24,500,000 [1]
Transfers to consolidated operations 0 [1] 0 [1] 0 [1]
Republic of the Congo | Natural Gas | Oil Reserves
      
Revenues      
Sales to unaffiliated enterprises 0 [1] 0 [1] 0 [1]
Other Regions
      
Costs and expenses      
Exploration costs charged to expense 241,800,000 54,300,000 77,700,000
Other Regions | Oil Reserves
      
Revenues      
Total oil and gas revenues 0 [1] 0 [1] 0 [1]
Other operating revenues 24,600,000 [1] 3,900,000 [1] 2,400,000 [1],[2]
Total revenues 24,600,000 [1] 3,900,000 [1] 2,400,000 [1]
Costs and expenses      
Production expenses 0 [1] 0 [1] 0 [1]
Exploration costs charged to expense 241,800,000 [1] 54,300,000 [1] 77,700,000 [1]
Undeveloped lease amortization 27,200,000 [1] 5,800,000 [1] 4,400,000 [1]
Depreciation, depletion and amortization 1,900,000 [1] 1,500,000 [1] 1,400,000 [1]
Accretion of asset retirement obligations 300,000 [1] 500,000 [1] 600,000 [1]
Impairment of properties 0 [1]   0 [1]
Terra Nova working interest redetermination 0 [1] 0 [1] 0 [1]
Selling and general expenses 39,800,000 [1] 33,600,000 [1] 23,800,000 [1]
Total costs and expenses 311,000,000 [1] 95,700,000 [1] 107,900,000 [1]
Results of Operations, Income before Income Taxes (286,400,000) [1] (91,800,000) [1] (105,500,000) [1]
Income tax expense (benefits) 7,500,000 [1] 500,000 [1] (600,000) [1]
Results of operations (293,900,000) [1] (92,300,000) [1] (104,900,000) [1]
Other Regions | Crude Oil and Natural Gas Liquids | Oil Reserves
      
Revenues      
Sales to unaffiliated enterprises 0 [1] 0 [1] 0 [1]
Transfers to consolidated operations 0 [1] 0 [1] 0 [1]
Other Regions | Natural Gas | Oil Reserves
      
Revenues      
Sales to unaffiliated enterprises $ 0 [1] $ 0 [1] $ 0 [1]
[1] Results exclude corporate overhead, interest and discontinued operations.
[2] Other operating revenues in the U.S. included $244.4 million for recovery of federal royalties paid on certain properties in the Gulf of Mexico. These royalties related to production for the years 2003 through 2009.
[3] Reclassified to conform to current presentation.