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Derivative Activities - Additional Information (Detail)		12 Months Ended
		Dec. 31, 2016 USD ($) MMBTU / d t_per_M MMBTU Counterparty Institution bbl	Dec. 31, 2014 USD ($)
Derivative [Line Items]
Number of financial institutions with whom we conduct derivative activities | Institution		22
Number of secured lenders not in banking credit facility | Counterparty		5
Designated as Hedging Instrument
Derivative [Line Items]
Gains (Losses) in oil and gas sales related to settled hedging transactions			$ 10,200,000
Derivatives Excluding Basis Swaps
Derivative [Line Items]
Derivative assets liabilities at fair value net		$ (187,200,000)
Natural Gas | Basis Swaps
Derivative [Line Items]
Derivative assets liabilities at fair value net		$ 11,800,000
Volume Hedged | MMBTU		66,210,000
Natural Gas | Swaps | 2017
Derivative [Line Items]
Volume Hedged | MMBTU / d	[1]	840,692
Natural Gas | Swaps | 2018
Derivative [Line Items]
Volume Hedged | MMBTU / d	[1]	276,712
Propane | Spread Swaps
Derivative [Line Items]
Derivative assets liabilities at fair value net		$ (742,000)
Propane | Spread Swaps | 2017
Derivative [Line Items]
Volume Hedged | bbl		1,637,500
Propane | Spread Swaps | 2018
Derivative [Line Items]
Volume Hedged | bbl		750,000
Freight | Swaps | Level 2
Derivative [Line Items]
Derivative assets liabilities at fair value net		$ 65,000
Volume Hedged | t_per_M		5,000
[1] Includes derivative instruments assumed in connection with the MRD Merger.

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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

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- Definition

The sum of the notional amount of derivative over the life of the entire contract, expressed in nonmonetary units. For example, the total number of British Thermal Unit (BTU) specified in a fuel oil forward purchase contract.

+ References

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- Definition

The sum of the notional amount of derivative over the life of the entire contract, expressed in nonmonetary units. For example, the total number of barrels specified in a fuel oil forward purchase contract.

+ References

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Number of counter parties not included in bank credit facility.

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Number of financial institutions with whom we conduct derivative activities.

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- Definition

Realized gain loss on cash flow hedging instruments.

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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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