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Derivative Activities - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 Institution Counterparty | Feb. 28, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Derivative [Line Items] |  |  |  |
Unrealized pre-tax derivative gain recorded in AOCI | $ 10,200,000 | $ 103,600,000 |  |
Gains (Losses) in oil and gas sales related to settled hedging transactions | 116,500,000 |  | 236,300,000 | 123,600,000
Gain (Loss) Recognized in Income (Ineffective Portion) | (2,930,000) |  | 1,125,000 | 9,544,000
Accumulated other comprehensive income, unrealized net gains, after tax balances, as March 1,2013 |  | 63,200,000 |  |
Number of financial institutions with whom we conduct derivative activities | 13 |  |  |
Number of secured lenders not in banking credit facility | 2 |  |  |
2014 |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized pre-tax derivative gain expected to be reclassified into earnings | 10,200,000 |  |  |
Derivatives Excluding Basis Swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative assets liabilities at fair value net | 16,500,000 |  |  |
Basis swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative assets liabilities at fair value net | $ 3,929,000 |  |  |
Volume Hedged | 320,280 |  |  |

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Number of counter parties not included in bank credit facility. + References No definition available. + Details
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- Definition Number of financial institutions with whom we conduct derivative activities. + References No definition available. + Details
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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 The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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