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Fair Value Measurements - Carrying Amounts and Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Liabilities |  |  |  |
Bank credit facility | $ (309,000) |  | $ (739,000) |
Deferred compensation plan | (207,906) |  | (187,604) |
Subordinated debt | (2,639,835) |  | (2,139,185) |
Carrying Value |  |  |  |
Assets |  |  |  |
Commodity swaps and collars | 127,519 |  | 153,267 |
Marketable securities | 62,036 | [1] | 57,776 | [1]
Liabilities |  |  |  |
Commodity swaps and collars |  |  | (7,934) |
Bank credit facility | (309,000) | [2] | (739,000) | [2]
Deferred compensation plan | (207,906) | [3] | (187,604) | [3]
Fair Value |  |  |  |
Assets |  |  |  |
Commodity swaps and collars | 127,519 |  | 153,267 |
Marketable securities | 62,036 | [1] | 57,776 | [1]
Liabilities |  |  |  |
Commodity swaps and collars |  |  | (7,934) |
Bank credit facility | (309,000) | [2] | (739,000) | [2]
Deferred compensation plan | (207,906) | [3] | (187,604) | [3]
7.25% Senior Subordinated notes due 2018 |  |  |  |
Liabilities |  |  |  |
Subordinated debt |  |  | (250,000) |
7.25% Senior Subordinated notes due 2018 | Carrying Value |  |  |  |
Liabilities |  |  |  |
Subordinated debt |  |  | (250,000) | [2]
7.25% Senior Subordinated notes due 2018 | Fair Value |  |  |  |
Liabilities |  |  |  |
Subordinated debt |  |  | (262,500) | [2]
8.00% Senior Subordinated notes due 2019 |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (289,835) |  | (289,185) |
8.00% Senior Subordinated notes due 2019 | Carrying Value |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (289,835) | [2] | (289,185) | [2]
8.00% Senior Subordinated notes due 2019 | Fair Value |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (319,500) | [2] | (332,250) | [2]
6.75% Senior Subordinated notes due 2020 |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (500,000) |  | (500,000) |
6.75% Senior Subordinated notes due 2020 | Carrying Value |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (500,000) | [2] | (500,000) | [2]
6.75% Senior Subordinated notes due 2020 | Fair Value |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (536,250) | [2] | (542,500) | [2]
5.75% Senior Subordinated Notes due 2021 | Carrying Value |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (500,000) | [2] | (500,000) | [2]
5.75% Senior Subordinated Notes due 2021 | Fair Value |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (515,000) | [2] | (535,000) | [2]
5.00% Senior Subordinated notes due 2022 |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (600,000) |  | (600,000) |
5.00% Senior Subordinated notes due 2022 | Carrying Value |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (600,000) | [2] | (600,000) | [2]
5.00% Senior Subordinated notes due 2022 | Fair Value |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (586,500) | [2] | (627,000) | [2]
5.00% senior subordinated notes due 2023 | Carrying Value |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (750,000) | [2] |  |
5.00% senior subordinated notes due 2023 | Fair Value |  |  |  |
Liabilities |  |  |  |
Subordinated debt | $ (733,125) | [2] |  |
[1] | Marketable securities, which are held in our deferred compensation plans, are actively traded on major exchanges. Refer to Note 13 for additional information.
[2] | The book value of our bank debt approximates fair value because of its floating rate structure. The fair value of our senior subordinated notes is based on end of period market quotes which are Level 2 market values. Refer to Note 8 for additional information.
[3] | The fair value of our deferred compensation plan is updated on the closing price on the balance sheet date.

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- Definition Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. + 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 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -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 The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6743817&loc=d3e1314-112600 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=6743817&loc=d3e1336-112600 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 6 -Paragraph 9, 10, 11 -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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