|
Estimated Quantities of Net Proved, Proved Developed and Proved Undeveloped Oil, Ngls and Natural Gas Reserves (Parenthetical) (Detail)
|
12 Months Ended | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2012
Changes due to price
Mcfe
|
Dec. 31, 2011
Changes due to price
Mcfe
|
Dec. 31, 2011
Changes due to marketing arrangement
Mcfe
|
Dec. 31, 2011
Changes at Tahoe field for compressor project
Mcfe
|
Dec. 31, 2011
Changes at the Fairway field
Mcfe
|
Dec. 31, 2011
Changes at the Main Pass 98 field
Mcfe
|
Dec. 31, 2013
Changes at the Ship Shoal 349/359 field
Mcfe
|
Dec. 31, 2011
Changes at the Ship Shoal 349/359 field
Mcfe
|
Dec. 31, 2011
Changes at the Main Pass 108 field
Mcfe
|
Dec. 31, 2013
Changes at the Spraberry field
Mcfe
|
Dec. 31, 2012
Changes at the Spraberry field
Mcfe
|
Dec. 31, 2012
Changes at the High Island 22 field
Mcfe
|
Dec. 31, 2013
Changes due to price
Mcfe
|
Dec. 31, 2013
Changes at the High Island 22 field
Mcfe
|
Dec. 31, 2013
Changes at the Main Pass 98 field
Mcfe
|
Dec. 31, 2013
Changes at the South Timbalier 314 field
Mcfe
|
Dec. 31, 2013
Changes at the Main Pass 108 field
Mcfe
|
Dec. 31, 2013
Changes at the South Timbalier 176 field
Mcfe
|
Dec. 31, 2013
Changes at the Mississippi Canyon 698 field
Mcfe
|
|
| Reserve Quantities [Line Items] | |||||||||||||||||||
| Revisions of previous estimates | (8,000,000) | 6,300,000 | 16,500,000 | 11,300,000 | 10,600,000 | (7,900,000) | (29,600,000) | (17,900,000) | 11,300,000 | (13,900,000) | 4,300,000 | 4,000,000 | 3,500,000 | 3,200,000 | |||||
| Extensions and discoveries | 13,900,000 | 25,300,000 | 8,000,000 | 3,700,000 | 75,400,000 | 69,500,000 | 16,200,000 | 11,500,000 | |||||||||||