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Derivative Activities - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) MMBTU / d bbl Counterparty Institution | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Derivative [Line Items] |  |  |
Number of financial institutions with whom we conduct derivative activities | Institution | 17 |  |
Number of secured lenders not in banking credit facility | Counterparty | 4 |  |
Gain (Loss) Recognized in Income (Ineffective Portion) | $ 0 | $ 0 | $ (2,930)
Not Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Accumulated other comprehensive income, net gains | 103,600 |  |
Accumulated other comprehensive income, net gains, after tax | 63,200 |  |
Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Gains (Losses) in oil and gas sales related to settled hedging transactions |  | $ 10,200 | $ 116,500
Derivatives Excluding Basis Swaps |  |  |
Derivative [Line Items] |  |  |
Derivative assets liabilities at fair value net | 283,300 |  |
Natural Gas | Basis Swaps |  |  |
Derivative [Line Items] |  |  |
Derivative assets liabilities at fair value net | $ 5,500 |  |
Volume Hedged | MMBTU / d | 53,365,000 |  |
Propane | Basis Swaps |  |  |
Derivative [Line Items] |  |  |
Derivative assets liabilities at fair value net | $ (1,100) |  |
Volume Hedged | bbl | 4,679 |  |

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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 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=56946850&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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