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Long-Term Debt - Additional Information (Detail) (USD $) | 3 Months Ended |  |  |  |  |  | 3 Months Ended |  |  |  |  |  |  | 3 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 0 Months Ended |  | 1 Months Ended |  |  |
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Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Senior credit facility | Aug. 31, 2012 Senior credit facility | Mar. 31, 2013 Senior credit facility Minimum | Mar. 31, 2013 Senior credit facility Maximum | Mar. 31, 2013 Senior credit facility LIBOR Minimum | Mar. 31, 2013 Senior credit facility LIBOR Maximum | Mar. 31, 2013 Senior credit facility Eurodollar Rate | Mar. 31, 2013 9.875% Senior Notes due 2016 | Dec. 31, 2012 9.875% Senior Notes due 2016 | Mar. 31, 2013 8.0% Senior Notes due 2018 | Dec. 31, 2012 8.0% Senior Notes due 2018 | Mar. 31, 2013 9.875% Senior Notes and 8.0% Senior Notes | Mar. 31, 2013 7.5% Senior Notes due 2023 | Dec. 31, 2012 7.5% Senior Notes due 2023 | Mar. 31, 2013 7.5% Senior Notes due 2021 | Dec. 31, 2012 7.5% Senior Notes due 2021 | Mar. 31, 2013 8.125% Senior Notes due 2022 | Dec. 31, 2012 8.125% Senior Notes due 2022 | Mar. 31, 2013 Senior Notes | Aug. 06, 2012 Senior Floating Rate Notes due 2014 | Aug. 31, 2012 2012 Activity 7.5% Senior Notes due 2023 | Mar. 31, 2013 2012 Activity 7.5% Senior Notes due 2023 | Aug. 31, 2012 2012 Activity 7.5% Senior Notes due 2021 | Mar. 31, 2013 2012 Activity 7.5% Senior Notes due 2021 | Apr. 17, 2012 2012 Activity 8.125% Senior Notes due 2022 | Mar. 31, 2013 2012 Activity 8.125% Senior Notes due 2022 | Aug. 31, 2012 2012 Activity 2012 Senior Notes | Mar. 31, 2013 2012 Activity 2012 Senior Notes | Aug. 31, 2012 Tendered by August 17, 2012 Senior Floating Rate Notes due 2014 | Sep. 04, 2012 Tendered after August 17, 2012 Senior Floating Rate Notes due 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, debt to EBITDA, ratio maximum |  |  |  |  |  | 4.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets to current liabilities, ratio minimum |  |  |  |  | 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, debt to EBITDA ratio, total funded debt determination |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity date |  |  | March 2017 |  |  |  |  |  |  | 2016 | 2016 | 2018 | 2018 |  | 2023 | 2023 | 2021 | 2021 | 2022 | 2022 |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, financial covenants compliance |  |  | As of and during the three-month period ended March 31, 2013, the Company was in compliance with all applicable financial covenants under the senior credit facility. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, guarantee |  |  | The obligations under the senior credit facility are guaranteed by certain Company subsidiaries and are secured by first priority liens on all shares of capital stock of certain of the Company’s material present and future subsidiaries; certain intercompany debt of the Company; and substantially all of the Company’s assets, including proved oil and natural gas reserves representing at least 80.0% of the discounted present value (as defined in the senior credit facility) of proved oil and natural gas reserves considered by the lenders in determining the borrowing base for the senior credit facility. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum collateral amount of proved oil and gas reserves representing the discounted present value of reserves used in borrowing base determination |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate determination reference |  |  | (a) LIBOR plus an applicable margin between 1.75% and 2.75% per annum or (b) the “base rate,” which is the highest of (i) the federal funds rate plus 0.5%, (ii) the prime rate published by Bank of America or (iii) the Eurodollar rate (as defined in the senior credit facility) plus 1.00% per annum, plus, in each case under scenario (b), an applicable margin between 0.75% and 1.75% per annum. Interest is payable quarterly for base rate loans and at the applicable maturity date for LIBOR loans, except that if the interest period for a LIBOR loan is six months, interest is paid at the end of each three-month period. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate, applicable margin |  |  |  |  | 0.75% | 1.75% | 1.75% | 2.75% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest rate in addition to federal funds rate |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility maximum borrowings capacity |  |  | 775,000,000 | 775,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity prior to additional debt issuance |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit, outstanding | 30,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost | 70,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,000,000 |  |
Long-term debt, fixed interest rate |  |  |  |  |  |  |  |  |  | 9.875% | 9.875% | 8.00% | 8.00% |  | 7.50% | 7.50% | 7.50% | 7.50% | 8.125% | 8.125% |  |  |  |  |  |  |  |  |  |  |  |
Debt tender offer, aggregate principal amount tendered |  |  |  |  |  |  |  |  |  | 365,500,000 |  | 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issuance date, month and year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | August 2012 |  |  |  | April 2012 |  |  |  |
Debt instrument redemption price per principal amount |  |  |  |  |  |  |  |  |  | 1,061.34 |  | 1,052.77 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 825,000,000 |  | 275,000,000 |  | 750,000,000 |  |  |  |
Net proceeds from Senior Notes issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 730,100,000 |  | 1,100,000,000 |  |  |
Selling price of Senior Notes issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.50% |  | 101.625% |  |  |  |  |  |  |
Debt instrument, covenant compliance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | As of and during the three and three-month periods ended March 31, 2013, the Company was in compliance with all of the covenants contained in the indentures governing its senior notes. |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate above LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.625% |  |  |  |  |  |  |  |  |  |
Percentage of aggregate senior notes outstanding principal amount purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94.30% |
Premium paid to purchase notes and unamortized debt issuance cost in relation to the notes | 82,005,000 | 0 |  |  |  |  |  |  |  |  |  |  |  | 82,005,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, restrictive covenants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The indentures governing the Company’s senior notes contain covenants which restrict the Company’s ability to take a variety of actions, including limitations on the incurrence of indebtedness, payment of dividends, investments, asset sales, certain asset purchases, transactions with related parties and consolidations or mergers. |  |  |  |  |  |  |  |  |  |  |
Aggregate senior notes outstanding principal amount purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,100,000
Debt tender offer, aggregate principal amount tendered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 329,900,000 |

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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination. + References No definition available. + Details
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