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Long-Term Debt - Additional Information (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  | 1 Months Ended |  |  | 1 Months Ended |  |  | 1 Months Ended | 12 Months Ended | 1 Months Ended |  | 1 Months Ended | 0 Months Ended |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 8.625% Senior Notes due 2015 | Apr. 30, 2011 8.625% Senior Notes due 2015 | Mar. 31, 2011 8.625% Senior Notes due 2015 | Dec. 31, 2012 Senior Floating Rate Notes due 2014 | Aug. 06, 2012 Senior Floating Rate Notes due 2014 | Mar. 31, 2012 Senior credit facility | Dec. 31, 2012 Senior credit facility | Dec. 31, 2011 Senior credit facility | Dec. 31, 2010 Senior credit facility | Oct. 31, 2012 Senior credit facility | Aug. 31, 2012 Senior credit facility | Mar. 29, 2012 Senior credit facility | Dec. 31, 2012 Senior credit facility Minimum | Dec. 31, 2012 Senior credit facility Maximum | Mar. 29, 2012 Senior credit facility Maximum | Dec. 31, 2012 Senior credit facility LIBOR Minimum | Dec. 31, 2012 Senior credit facility LIBOR Maximum | Dec. 31, 2012 Senior credit facility Eurodollar Rate | Dec. 31, 2012 9.875% Senior Notes due 2016 | Dec. 31, 2011 9.875% Senior Notes due 2016 | Dec. 31, 2012 8.0% Senior Notes due 2018 | Dec. 31, 2011 8.0% Senior Notes due 2018 | Dec. 31, 2012 7.5% Senior Notes due 2023 | Mar. 31, 2011 7.5% Senior Notes due 2021 | Dec. 31, 2012 7.5% Senior Notes due 2021 | Dec. 31, 2011 7.5% Senior Notes due 2021 | May 31, 2012 Other notes payable Mortgage note payable | Dec. 31, 2012 8.125% Senior Notes due 2022 | Aug. 31, 2012 Tendered by August 17, 2012 Senior Floating Rate Notes due 2014 | Aug. 31, 2012 2012 Activity 2012 Senior Notes | Dec. 31, 2012 2012 Activity 2012 Senior Notes | Aug. 31, 2012 2012 Activity 7.5% Senior Notes due 2023 | Dec. 31, 2012 2012 Activity 7.5% Senior Notes due 2023 | Aug. 31, 2012 2012 Activity 7.5% Senior Notes due 2021 | Apr. 17, 2012 2012 Activity 8.125% Senior Notes due 2022 | Dec. 31, 2012 2012 Activity 8.125% Senior Notes due 2022 | Sep. 04, 2012 Tendered after August 17, 2012 Senior Floating Rate Notes due 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility amended maximum borrowings capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility maximum borrowings capacity |  |  |  |  |  |  |  |  |  |  |  |  | 775,000,000 | 775,000,000 | 790,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of additional debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 2018 |  | 2023 |  | 2021 |  |  | 2022 |  |  |  |  |  |  |  |  |
Minimum collateral amount of proved oil and gas reserves representing the discounted present value of reserves used in borrowing base determination |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate, applicable margin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.75% | 1.75% |  | 1.75% | 2.75% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, 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, amount outstanding |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, average annual interest rates |  |  |  |  |  |  |  |  |  |  | 2.69% | 2.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity prior to additional debt issuance |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, additional costs as a result of amendments to the credit agreement and changes to the borrowing base |  |  |  |  |  |  |  |  |  | 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit, outstanding | 30,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amendment description |  |  |  |  |  |  |  |  | On March 29, 2012, the senior credit facility was amended and restated to, among other things, (a) increase the borrowing base to $1.0 billion from $790.0 million, (b) allow for the incurrence or issuance of additional debt (including up to $750.0 million of unsecured debt to finance the cash portion of the Dynamic purchase price and related costs and expenses), (c) permit the Company to designate certain of its subsidiaries as unrestricted subsidiaries, and (d) effective on and after June 30, 2012, establish the financial covenants as maintaining agreed upon levels for (i) ratio of total funded debt to EBITDA, which may not exceed 4.5:1.0 at each quarter end, calculated using the last four completed fiscal quarters and (ii) ratio of current assets to current liabilities, which must be at least 1.0:1.0 at each quarter end. If no amounts are drawn under the senior credit facility when calculating the ratio of total funded debt to EBITDA, the Company’s debt is reduced by its cash balance in excess of $10.0 million. In the current ratio calculation, any amounts available to be drawn under the senior credit facility are included in current assets, and unrealized assets and liabilities resulting from mark-to-market adjustments on the Company’s derivative contracts are disregarded. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, financial covenants compliance |  |  |  |  |  |  |  |  |  | As of and during the year ended December 31, 2012, the Company was in compliance with all applicable financial covenants under the senior credit facility. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, collateral |  |  |  |  |  |  |  |  |  | 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, interest rate determination reference |  |  |  |  |  |  |  |  |  | (a) the London Interbank Offered Rate (“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. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost, cumulative | 94,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,000,000 |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  |  |  |  | 8.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.875% | 9.875% | 8.00% | 8.00% | 7.50% |  | 7.50% | 7.50% |  | 8.125% |  |  |  |  |  |  |  |  |
Senior notes issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of aggregate senior notes outstanding principal amount purchased |  |  |  |  |  | 94.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate senior notes outstanding principal amount purchased |  |  |  |  | 35,800,000 | 614,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,100,000
Premium paid to purchase notes and unamortized debt issuance cost in relation to the notes | (3,075,000) | (38,232,000) | 0 | (38,232,000) |  |  | (3,075,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument issuance date, month and year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | August 2012 |  |  | April 2012 |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 825,000,000 |  | 275,000,000 |  |  |
Face amount of Senior Notes issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 750,000,000 |  |
Proceeds from debt, net of issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000,000 |  |  |  |  | 730,100,000 |  |
Debt tender offer, aggregate principal amount tendered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 329,900,000 |  |  |  |  |  |  |  |
Debt Tendered Percentage Of Principal Amount Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94.30% |  |  |  |  |  |  |  |
Selling price of Senior Notes issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.50% |  | 101.625% |  |  |
Long-term debt, interest rate above LIBOR |  |  |  |  |  |  |  | 3.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Tender Offer Aggregate Principal Amount |  |  |  |  |  |  |  | 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, payment of outstanding principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,800,000 |  |  |  |  |  |  |  |  |  |
Long-term debt, maturities, repayments of principal in 2016 | 365,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, maturities, repayments of principal thereafter | $ 4,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount by which the cash balance must be exceeded to reduce total funded debt in the debt to EBITDA ratio calculation when no amounts have been drawn under the credit facility. + References No definition available. + Details
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- Definition Minimum collateral amount of proved oil and gas reserves representing the discounted present value of reserves used in borrowing base determination. + References No definition available. + Details
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- Definition Debt Instrument Interest Additional Interest Above Federal Fund Rate + References No definition available. + Details
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- Definition Debt instrument issuance date, month and year + References No definition available. + Details
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- Definition Debt Instrument, Principal Amount, Redeemed + References No definition available. + Details
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- Definition Debt issuance expense that was capitalized and is being amortized over the life of the respective debt. + References No definition available. + Details
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- Definition Debt Tender Offer Aggregate Principal Amount + References No definition available. + Details
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- Definition Debt Tender Offer Aggregate Principal Amount. + References No definition available. + Details
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- Definition Debt To EBITDA Ratio, Maximum + References No definition available. + Details
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- Definition The maximum amount of incurrence or issuance of additional debt allowed by the terms of the amended credit facility agreement. + References No definition available. + Details
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- Definition Line of credit facility borrowing capacity prior to additional debt issuance + References No definition available. + Details
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- Definition The cash inflow from borrowing associated with the Senior Notes. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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. + Details
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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 26 -Paragraph 20, 21 -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition Discussion of whether the borrowings under the credit facility are secured or unsecured and, if secured, a description of collateral (for example, accounts receivable less than 120 days old, finished goods inventory). + 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.(b)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: 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 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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