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Fair Value Measurements - Carrying Amounts and Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Assets |  |  |  |
Commodity swaps, collars and basis swaps | $ 13,654 |  | $ 153,267 |
Marketable securities | 67,766 |  | 57,776 |
Liabilities |  |  |  |
Commodity swaps, collars and basis swaps | 26,223 |  | 7,934 |
Bank credit facility | (500,000) |  | (739,000) |
Deferred compensation plan | (247,537) |  | (187,604) |
Subordinated debt | (2,640,516) |  | (2,139,185) |
Carrying Value |  |  |  |
Assets |  |  |  |
Commodity swaps, collars and basis swaps | 13,654 |  | 153,267 |
Marketable securities | 67,766 | [1] | 57,776 | [1]
Liabilities |  |  |  |
Commodity swaps, collars and basis swaps | (26,223) |  | (7,934) |
Bank credit facility | (500,000) | [2] | (739,000) | [2]
Deferred compensation plan | (271,738) | [3] | (201,889) | [3]
Fair Value |  |  |  |
Assets |  |  |  |
Commodity swaps, collars and basis swaps | 13,654 |  | 153,267 |
Marketable securities | 67,766 | [1] | 57,776 | [1]
Liabilities |  |  |  |
Commodity swaps, collars and basis swaps | (26,223) |  | (7,934) |
Bank credit facility | (500,000) | [2] | (739,000) | [2]
Deferred compensation plan | (271,738) | [3] | (201,889) | [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 | (290,516) |  | (289,185) |
8.00% Senior Subordinated notes due 2019 | Carrying Value |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (290,516) | [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 | (541,250) | [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 | (530,625) | [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 | (588,750) | [2] | (627,000) | [2]
5.00% Senior Subordinated notes due 2023 |  |  |  |
Liabilities |  |  |  |
Subordinated debt | (750,000) |  |  |
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 | $ (732,188) | [2] |  |
[1] | Marketable securities are held in our deferred compensation plans that are actively traded on major exchanges.
[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 inputs.
[3] | The fair value of our deferred compensation plan is updated based on the closing price on the balance sheet date.

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + 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=28364263&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=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + 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=28364263&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=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 -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=28361426&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=28361426&loc=d3e1336-112600 + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + 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 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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