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Indebtedness - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |  |  | 1 Months Ended | 6 Months Ended |  |  | 6 Months Ended
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Jun. 30, 2013 CommercialBank | Jun. 30, 2012 | Jun. 30, 2013 CommercialBank | Jun. 30, 2012 | Apr. 08, 2013 | Dec. 31, 2012 | Apr. 30, 2013 7.25% Senior Subordinated notes due 2018 | Jun. 30, 2013 5.00% Senior Subordinated notes due 2023 | Jun. 30, 2013 5.00% Senior Subordinated notes due 2023 | Dec. 31, 2012 5.00% Senior Subordinated notes due 2023 | Jun. 30, 2013 5.00% Senior Subordinated notes due 2023 Senior note redeemed in March 15, 2018 | Jun. 30, 2013 5.00% Senior Subordinated notes due 2023 Senior note redeemed in March 15, 2021 | Jun. 30, 2013 5.00% Senior Subordinated notes due 2023 Senior note redeemed in March 15, 2016 | Jun. 30, 2013 Minimum Ratio | Jun. 30, 2013 Maximum Ratio
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest capitalized during the period | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |
Bank Credit facility, Facility amount | 1,750,000,000 |  | 1,750,000,000 |  | 1,750,000,000 |  |  |  |  |  |  |  |  |  |
Bank Credit facility, Borrowing base | 2,000,000,000 |  | 2,000,000,000 |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |
Percentage holding of commercial banks, Maximum | 9.00% |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |
Number of commercial banks included in current bank group | 28 |  | 28 |  |  |  |  |  |  |  |  |  |  |  |
Notice period for increase in facility amount | 20 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank debt | 309,000,000 |  | 309,000,000 |  |  | 739,000,000 |  |  |  |  |  |  |  |  |
Undrawn letters of credit | 84,700,000 |  | 84,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity available under the facility amount | 1,400,000,000 |  | 1,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of loan | Feb. 18, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread for Alternate Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 1.50%
Spread for LIBOR Rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% | 2.50%
Weighted average interest rate on the bank credit facility | 2.20% | 2.70% | 2.10% | 2.30% |  |  |  |  |  |  |  |  |  |  |
Annual rate of commitment fee paid on the undrawn balance |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.375% | 0.50%
Commitment fee | 0.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin on LIBOR loans | 1.50% |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin on base rate loans | 0.50% |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of senior subordinated notes |  |  |  |  |  |  |  | 750,000,000 | 750,000,000 |  |  |  |  |  |
Interest rate on senior subordinated notes |  |  |  |  |  |  |  | 5.00% | 5.00% | 5.00% |  |  |  |  |
Net proceeds from issuance of subordinated notes |  |  |  |  |  |  |  |  | 738,800,000 |  |  |  |  |  |
Deferred Finance Costs |  |  |  |  |  |  |  | 11,200,000 | 11,200,000 |  |  |  |  |  |
Aggregate principal amount of senior subordinated notes exchanged |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Maximum redemption price of notes as percentage of principal amount |  |  |  |  |  |  |  |  |  |  | 102.50% | 100.00% | 105.00% |  |
Maximum percentage of original aggregate amount of notes that can be redeemed |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% |  |
Minimum percentage of original aggregate principal amount of notes to remain outstanding immediately after redemption |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |
Maximum number of days after the date of the closing of the equity offering that the redemption should occur |  |  |  |  |  |  |  |  |  |  |  |  | 60 days |  |
Purchase price of senior subordinate notes as a percentage of principal | 101.00% |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |
Announced call for redemption amount of debt |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |
Loss on early extinguishment of debt | $ 12,280,000 |  | $ 12,280,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt redemption price percent of par |  |  |  |  |  |  | 103.625% |  |  |  |  |  |  |  |
Ratio of debt to EBITDAX |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.0 | 4.25
Current ratio |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.0 | 1.0

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