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Fair Value Measurements - Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2013 Fair Value, Measurements, Recurring | Dec. 31, 2012 Fair Value, Inputs, Level 1 | Dec. 31, 2013 Fair Value, Inputs, Level 1 Fair Value, Measurements, Recurring | Dec. 31, 2012 Swaps | Dec. 31, 2013 Swaps Fair Value, Measurements, Recurring | Dec. 31, 2012 Swaps Fair Value, Inputs, Level 2 | Dec. 31, 2013 Swaps Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring | Dec. 31, 2012 Collars | Dec. 31, 2013 Collars Fair Value, Measurements, Recurring | Dec. 31, 2012 Collars Fair Value, Inputs, Level 2 | Dec. 31, 2013 Collars Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring | Dec. 31, 2012 Basis Swap | Dec. 31, 2013 Basis Swap Fair Value, Measurements, Recurring | Dec. 31, 2012 Basis Swap Fair Value, Inputs, Level 2 | Dec. 31, 2013 Basis Swap Fair Value, Inputs, Level 2 Fair Value, Measurements, Recurring | Dec. 31, 2013 Basis Swap Fair Value, Inputs, Level 3 Fair Value, Measurements, Recurring
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading securities held in the deferred compensation plans | $ 57,776 | $ 67,766 | $ 57,776 | $ 67,766 |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets liabilities at fair value net |  |  |  |  | $ 23,326 | $ (18,812) | $ 23,326 | $ (18,812) | $ 121,014 | $ 2,314 | $ 121,014 | $ 2,314 | $ 993 | $ 3,929 | $ 993 | $ 3,381 | $ 548

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: 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 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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