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Long-Term Debt - Additional Information (Detail) (USD $)
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12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | ||||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2013
Minimum
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Dec. 31, 2013
Maximum
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Oct. 24, 2012
8.50% Senior Notes, due June 15, 2019
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Jun. 10, 2011
8.50% Senior Notes, due June 15, 2019
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Dec. 31, 2013
8.50% Senior Notes, due June 15, 2019
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Dec. 31, 2012
8.50% Senior Notes, due June 15, 2019
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Dec. 31, 2013
8.50% Senior Notes, due June 15, 2019
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Nov. 30, 2013
Revolving Bank Credit Facility Due November 8, 2018
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Dec. 31, 2013
Revolving Bank Credit Facility Due November 8, 2018
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Nov. 08, 2013
Revolving Bank Credit Facility Due November 8, 2018
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Dec. 31, 2012
Revolving Bank Credit Facility Due November 8, 2018
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| Debt Instrument [Line Items] | |||||||||||||||||
| Long-term Debt unsecured | $ 900,000,000 | $ 900,000,000 | $ 300,000,000 | $ 600,000,000 | $ 900,000,000 | $ 900,000,000 | |||||||||||
| Debt issuance, premium percentage | 106.00% | ||||||||||||||||
| Senior notes interest rate | 8.50% | 8.50% | 8.50% | 8.50% | 8.25% | ||||||||||||
| Senior notes maturity date | Jun. 15, 2019 | Jun. 15, 2019 | Jun. 15, 2019 | Jun. 15, 2019 | Jun. 01, 2014 | Nov. 08, 2018 | |||||||||||
| Net proceeds after fees and expenses | 312,000,000 | 593,500,000 | |||||||||||||||
| Effective interest rate | 8.40% | 7.70% | 3.80% | ||||||||||||||
| Senior notes | 1,205,421,000 | [1] | 1,087,611,000 | [1] | 450,000,000 | ||||||||||||
| Cost related to repurchase of senior notes | 22,000,000 | ||||||||||||||||
| Senior notes payment terms | semi-annually in arrears on June 15 and December 15 of each year | ||||||||||||||||
| Estimated senior notes fair value | 962,500,000 | 963,000,000 | |||||||||||||||
| Revolving bank credit facility borrowing base | 800,000,000 | ||||||||||||||||
| Revolving bank credit facility maximum lender commitment | 1,200,000,000 | ||||||||||||||||
| Letters of credit outstanding | 400,000 | 600,000 | 300,000,000 | ||||||||||||||
| Credit agreement expiration date | Nov. 08, 2018 | ||||||||||||||||
| Restriction on payment of dividends | 60,000,000 | ||||||||||||||||
| Common stock and senior note repurchases | 100,000,000 | ||||||||||||||||
| Percentage of hedging contracts | 75.00% | ||||||||||||||||
| Percentage adjustment used to adjust the borrowing base | 0.25 | ||||||||||||||||
| Revolving bank credit facility interest rate description | Borrowings under the revolving bank credit facility bear interest at the applicable London Interbank Offered Rate (“LIBOR”) plus a margin that varies from 1.75% to 2.75% depending on the level of total borrowings under the Credit Agreement, or an alternative base rate equal to the greater of (a) Prime Rate, (b) Federal Funds Rate plus 0.5%, and (c) LIBOR plus 1.0%, plus applicable margin ranging from 0.75% to 1.75%. | ||||||||||||||||
| Unused portion of the borrowing base commitment fee | 0.375% | 0.50% | |||||||||||||||
| Leverage ratio | 1.0 | 3.5 | |||||||||||||||
| Current ratio | 1.0 | 1.0 | |||||||||||||||
| Long-term debt secured | $ 290,000,000 | $ 170,000,000 | $ 290,000,000 | $ 170,000,000 | |||||||||||||
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