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Long-Term Debt - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |  | 6 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended |  |  | 0 Months Ended |  | 1 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 0 Months Ended |
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Senior credit facility | Jun. 30, 2013 Senior credit facility | Mar. 31, 2013 Senior credit facility | Aug. 31, 2012 Senior credit facility | Jun. 30, 2013 Senior credit facility Minimum | Jun. 30, 2013 Senior credit facility Maximum | Jun. 30, 2013 Senior credit facility Addition to LIBOR per annum Minimum | Jun. 30, 2013 Senior credit facility Addition to LIBOR per annum Maximum | Jun. 30, 2013 Senior credit facility Addition to federal funds rate | Jun. 30, 2013 Senior credit facility Addition to Eurodollar rate per annum | Jun. 30, 2013 Senior credit facility Applicable margin to base rate per annum Minimum | Jun. 30, 2013 Senior credit facility Applicable margin to base rate per annum Maximum | Aug. 31, 2012 Senior credit facility Prior to additional debt issuance | Jun. 30, 2013 9.875% Senior Notes due 2016 | Mar. 31, 2013 9.875% Senior Notes due 2016 | Dec. 31, 2012 9.875% Senior Notes due 2016 | Jun. 30, 2013 8.0% Senior Notes due 2018 | Mar. 31, 2013 8.0% Senior Notes due 2018 | Dec. 31, 2012 8.0% Senior Notes due 2018 | Jun. 30, 2013 9.875% Senior Notes and 8.0% Senior Notes | Jun. 30, 2013 7.5% Senior Notes due 2023 | Dec. 31, 2012 7.5% Senior Notes due 2023 | Aug. 31, 2012 7.5% Senior Notes due 2023 2012 Activity | Jun. 30, 2013 7.5% Senior Notes due 2023 2012 Activity | Jun. 30, 2013 7.5% Senior Notes due 2021 | Dec. 31, 2012 7.5% Senior Notes due 2021 | Aug. 31, 2012 7.5% Senior Notes due 2021 2012 Activity | Jun. 30, 2013 7.5% Senior Notes due 2021 2012 Activity | Jun. 30, 2013 8.125% Senior Notes due 2022 | Dec. 31, 2012 8.125% Senior Notes due 2022 | Apr. 17, 2012 8.125% Senior Notes due 2022 2012 Activity | Jun. 30, 2013 8.125% Senior Notes due 2022 2012 Activity | Aug. 31, 2012 2012 Senior Notes 2012 Activity | Jun. 30, 2013 2012 Senior Notes 2012 Activity | Jun. 30, 2013 Senior Notes | Jun. 30, 2013 Senior Notes | Aug. 06, 2012 Senior Floating Rate Notes due 2014 | Sep. 04, 2012 Senior Floating Rate Notes due 2014 Tendered after August 17, 2012 | Aug. 31, 2012 Senior Floating Rate Notes due 2014 Tendered by August 17, 2012
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity date |  |  |  |  | March 2017 | 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 and six-month periods ended June 30, 2013, the Company was in compliance with all applicable financial covenants under the senior credit facility. | As of and during the three and six-month periods ended June 30, 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. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of 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% | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, basis spread on variable rate |  |  |  |  |  |  |  |  |  |  | 1.75% | 2.75% | 0.50% | 1.00% | 0.75% | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.625% |  |
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, unused capacity, commitment fee percentage |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility maximum borrowings capacity |  |  |  |  | 775,000,000 | 775,000,000 | 775,000,000 | 775,000,000 |  |  |  |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credity facility, letters of credit outstanding | 28,600,000 |  | 28,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost | 70,200,000 |  | 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 instrument issuance date, month and year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | August 2012 |  |  |  |  |  |  |  | April 2012 |  |  |  |  |  |  |
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 tender offer, aggregate principal amount tendered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 365,500,000 |  |  | 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument redemption price per principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,061.34 |  |  | 1,052.77 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium paid to purchase notes and unamortized debt issuance cost in relation to the notes | 0 | 0 | 82,005,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82,005,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, restrictive covenants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Each of the indentures governing the Company’s Senior Fixed Rate Notes contains covenants that 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. |  |  |
Debt instrument, covenant compliance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | As of and during the three and six-month periods ended June 30, 2013, the Company was in compliance with all of the covenants contained in the indentures governing its senior notes. | As of and during the three and six-month periods ended June 30, 2013, the Company was in compliance with all of the covenants contained in the indentures governing its senior notes. |  |  |
Percentage of aggregate senior notes outstanding principal amount purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94.30%
Debt tender offer, aggregate principal amount tendered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 329,900,000
Aggregate senior notes outstanding principal amount purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,100,000 |

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- Definition Description of covenants that limit or prohibit certain actions or activities without the lender's prior consent within a specified period of time or until certain specified targets are achieved for example, reduction of the debt or an increase in net worth to a specified amount). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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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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