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Fair Value Measurements - Estimated Fair Value and Carrying Value of Senior Notes (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Carrying Value | $ 3,194,660 |  | $ 4,301,083 |
9.875% Senior Notes due 2016 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Carrying Value | 0 | [1] | 356,657 | [1]
8.0% Senior Notes due 2018 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Carrying Value | 0 |  | 750,000 |
8.75% Senior Notes due 2020 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Carrying Value | 444,425 | [2] | 444,127 | [2]
7.5% Senior Notes due 2021 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Carrying Value | 1,179,128 | [3] | 1,179,328 | [3]
8.125% Senior Notes due 2022 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Carrying Value | 750,000 |  | 750,000 |
7.5% Senior Notes due 2023 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Carrying Value | 821,107 | [4] | 820,971 | [4]
Fair Value Measurements Level 2 | 9.875% Senior Notes due 2016 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Fair Value | 0 | [1] | 392,913 | [1]
Fair Value Measurements Level 2 | 8.0% Senior Notes due 2018 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Fair Value | 0 |  | 790,313 |
Fair Value Measurements Level 2 | 8.75% Senior Notes due 2020 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Fair Value | 457,875 | [2] | 490,500 | [2]
Fair Value Measurements Level 2 | 7.5% Senior Notes due 2021 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Fair Value | 1,116,250 | [3] | 1,257,250 | [3]
Fair Value Measurements Level 2 | 8.125% Senior Notes due 2022 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Fair Value | 742,500 |  | 823,125 |
Fair Value Measurements Level 2 | 7.5% Senior Notes due 2023 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |
Fair Value | $ 781,688 | [4] | $ 882,750 | [4]
[1] | Carrying value is net of $8,843 discount at December 31, 2012.
[2] | Carrying value is net of $5,575 and $5,873 discount at June 30, 2013 and December 31, 2012, respectively.
[3] | Carrying value includes a premium, applicable to notes issued in August 2012, of $4,128 and $4,328 at June 30, 2013 and December 31, 2012, respectively.
[4] | Carrying value is net of $3,893 and $4,029 discount at June 30, 2013 and December 31, 2012, respectively.

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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