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Acquisitions and Divestitures - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 1 Months Ended | |||||||||||||||||||||||
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2012
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May 15, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2012
Yellow Rose Properties And Fairway Properties
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Dec. 31, 2011
Yellow Rose Properties And Fairway Properties
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Dec. 31, 2010
Yellow Rose Properties And Fairway Properties
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Oct. 05, 2012
Newfield Properties
acre
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Dec. 31, 2012
Newfield Properties
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Dec. 31, 2012
Newfield Properties
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Dec. 31, 2011
Newfield Properties
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Oct. 05, 2012
Newfield Properties
8.50% Senior Notes
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Oct. 05, 2012
Newfield Properties
Overriding Royalty Interests
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Dec. 31, 2010
Tahoe Properties
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Nov. 04, 2010
Tahoe Properties
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May 11, 2011
Yellow Rose Properties
acre
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Apr. 30, 2010
Total Properties
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Apr. 30, 2010
Total Properties
Matterhorn
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Apr. 30, 2010
Total Properties
Virgo Field
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Nov. 04, 2010
Shell
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Nov. 04, 2010
Shell
Tahoe field (Viosca Knoll 784)
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Nov. 04, 2010
Shell
Southeast Tahoe field (Viosca Knoll 784)
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Nov. 04, 2010
Shell
Droshky field (Green Canyon 244)
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Aug. 10, 2011
Fairway Properties
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| Business Acquisition [Line Items] | ||||||||||||||||||||||||||||||||
| Total cash paid for acquisition | $ 205,550,000 | $ 116,233,000 | $ 394,377,000 | $ 115,012,000 | $ 116,200,000 | $ 42,870,000 | ||||||||||||||||||||||||||
| Number of federal offshore blocks | 78 | 3 | ||||||||||||||||||||||||||||||
| Leasehold interest acres acquired, gross | 416,000 | 24,500 | ||||||||||||||||||||||||||||||
| Leasehold interest acres acquired, net | 268,000 | 21,900 | ||||||||||||||||||||||||||||||
| Number of deep water federal offshore blocks | 65 | 3 | ||||||||||||||||||||||||||||||
| Number of productive deep water federal offshore blocks | 6 | 2 | ||||||||||||||||||||||||||||||
| Number of conventional shelf blocks | 10 | |||||||||||||||||||||||||||||||
| Number of producing conventional shelf blocks | 4 | |||||||||||||||||||||||||||||||
| Issuance of senior notes | 300,000,000 | |||||||||||||||||||||||||||||||
| Business acquisition general administrative expenses | 1,600,000 | 600,000 | 600,000 | 600,000 | 500,000 | |||||||||||||||||||||||||||
| Revenue | 237,146,000 | 185,946,000 | 215,513,000 | 235,886,000 | 261,899,000 | 245,371,000 | 252,922,000 | 210,855,000 | 874,491,000 | 971,047,000 | 705,783,000 | 64,000,000 | 29,600,000 | 97,200,000 | ||||||||||||||||||
| Direct operating expenses | 25,500,000 | 5,400,000 | 19,900,000 | |||||||||||||||||||||||||||||
| Depreciation, depletion and amortization | 336,177,000 | 299,015,000 | 268,415,000 | 20,500,000 | 11,900,000 | 27,900,000 | ||||||||||||||||||||||||||
| Income taxes | 47,547,000 | 91,517,000 | 11,901,000 | 6,300,000 | 4,300,000 | 17,300,000 | ||||||||||||||||||||||||||
| Net income | 16,670,000 | (1,471,000) | 53,567,000 | 3,218,000 | 46,065,000 | 52,928,000 | 55,175,000 | 18,649,000 | 71,984,000 | 172,817,000 | 117,892,000 | 11,700,000 | 8,000,000 | 32,100,000 | ||||||||||||||||||
| Business acquisition, incremental revenue adjustments | 52,400,000 | 79,200,000 | 105,700,000 | 216,800,000 | 112,400,000 | |||||||||||||||||||||||||||
| Business acquisition, incremental operating costs | 16,400,000 | 25,300,000 | 33,200,000 | 24,600,000 | 25,300,000 | |||||||||||||||||||||||||||
| Business acquisition, incremental insurance costs estimation | 600,000 | |||||||||||||||||||||||||||||||
| Purchase Price Allocation of Unevaluated Properties for Oil and Gag Interests | 123,503,000 | 154,516,000 | 123,503,000 | 154,516,000 | 81,200,000 | 13,100,000 | 13,100,000 | |||||||||||||||||||||||||
| Business acquisition, incremental depreciation depletion amortization and accretion | 21,900,000 | 50,400,000 | 53,400,000 | 102,700,000 | 39,600,000 | |||||||||||||||||||||||||||
| Assumed borrowings | 1,087,611,000 | 717,000,000 | 1,087,611,000 | 717,000,000 | 205,600,000 | 205,600,000 | ||||||||||||||||||||||||||
| Effective interest rate | 7.70% | 7.70% | ||||||||||||||||||||||||||||||
| Business acquisition, incremental interest expense estimation | 4,600,000 | 12,900,000 | 12,000,000 | 15,800,000 | ||||||||||||||||||||||||||||
| Business acquisition, incremental capitalized interest estimation | 1,100,000 | 3,000,000 | 600,000 | 900,000 | ||||||||||||||||||||||||||||
| Federal statutory income tax rate | 35.00% | 35.00% | 35.00% | 35.00% | 35.00% | 35.00% | ||||||||||||||||||||||||||
| Business acquisition, incremental income tax expense estimation | 4,300,000 | 2,200,000 | 2,700,000 | 25,900,000 | 16,400,000 | |||||||||||||||||||||||||||
| Percentage of working interest include in producing interest | 100.00% | 64.00% | 70.00% | 100.00% | 64.30% | |||||||||||||||||||||||||||
| Business acquisition debt instrument, interest rate, minimum | 3.10% | |||||||||||||||||||||||||||||||
| Business acquisition debt instrument, interest rate, maximum | 3.50% | |||||||||||||||||||||||||||||||
| Percentage of Royalty Interest | 6.25% | |||||||||||||||||||||||||||||||
| Business acquisition, estimated decrease in interest income | 1,100,000 | |||||||||||||||||||||||||||||||
| Percentage of non-operating working interest sold | 40.00% | |||||||||||||||||||||||||||||||
| Proceeds from sale of non-operating working interest | 30,500,000 | |||||||||||||||||||||||||||||||
| Reversal of asset retirement obligation | $ 4,000,000 | |||||||||||||||||||||||||||||||