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Fair Value Measurements - Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value (Detail) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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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 | $ 68,129 | $ 67,766
Swaps |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | (54,665) | (18,812)
Collars |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | (13,849) | 2,314
Basis Swaps |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 8,672 | 3,929
Fair Value, Inputs, Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading securities held in the deferred compensation plans | 68,129 | 67,766
Fair Value, Inputs, Level 1 | Swaps |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net |  |
Fair Value, Inputs, Level 1 | Collars |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net |  |
Fair Value, Inputs, Level 1 | Basis Swaps |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net |  |
Fair Value, Inputs, Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading securities held in the deferred compensation plans |  |
Fair Value, Inputs, Level 2 | Swaps |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | (54,665) | (18,812)
Fair Value, Inputs, Level 2 | Collars |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | (13,849) | 2,314
Fair Value, Inputs, Level 2 | Basis Swaps |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 6,319 | 3,381
Fair Value, Inputs, Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading securities held in the deferred compensation plans |  |
Fair Value, Inputs, Level 3 | Swaps |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net |  |
Fair Value, Inputs, Level 3 | Collars |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net |  |
Fair Value, Inputs, Level 3 | Basis Swaps |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | $ 2,353 | $ 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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