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Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Debt | $ 3,194,543 |  | $ 4,301,083 |
Less: current maturities of long-term debt | 0 |  | 0 |
Long-term debt | 3,194,543 |  | 4,301,083 |
Senior credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 0 |  | 0 |
9.875% Senior Notes due 2016, net of $8,843 discount at December 31, 2012 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 0 | [1] | 356,657 | [1]
8.0% Senior Notes due 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 0 |  | 750,000 |
8.75% Senior Notes due 2020, net of $5,725 and $5,873 discount, respectively |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 444,275 | [2] | 444,127 | [2]
7.5% Senior Notes due 2021, including a premium of $4,230 and $4,328, respectively |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 1,179,230 | [3] | 1,179,328 | [3]
8.125% Senior Notes due 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 750,000 |  | 750,000 |
7.5% Senior Notes due 2023, net of $3,962 and $4,029 discount, respectively |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | $ 821,038 | [4] | $ 820,971 | [4]
[1] | Carrying value is net of $8,843 discount at December 31, 2012.
[2] | Carrying value is net of $5,725 and $5,873 discount at March 31, 2013 and December 31, 2012, respectively.
[3] | Carrying value includes a premium of $4,230 and $4,328 at March 31, 2013 and December 31, 2012, respectively, applicable to notes issued in August 2012.
[4] | Carrying value is net of $3,962 and $4,029 discount at March 31, 2013 and December 31, 2012, respectively.

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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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: 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 6: 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 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. 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 FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). 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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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