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Derivative Activities - Additional Information (Detail) | Sep. 30, 2016 USD ($) MMBTU / d t_per_M MMBTU bbl
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Derivatives Excluding Basis Swaps |  |
Derivative [Line Items] |  |
Derivative assets liabilities at fair value net | $ 150,900,000 |
Natural Gas | Basis Swaps |  |
Derivative [Line Items] |  |
Derivative assets liabilities at fair value net | $ 13,800,000 |
Volume Hedged | MMBTU | 59,385,000 |
Natural Gas | Swaps | 2016 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 901,739 | [1]
Natural Gas | Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | MMBTU / d | 478,192 | [1]
Propane | Spread Swaps |  |
Derivative [Line Items] |  |
Derivative assets liabilities at fair value net | $ 4,100,000 |
Propane | Spread Swaps | 2016 |  |
Derivative [Line Items] |  |
Volume Hedged | bbl | 525,000 |
Propane | Spread Swaps | 2017 |  |
Derivative [Line Items] |  |
Volume Hedged | bbl | 1,837,500 |
Freight | Swaps | Level 2 |  |
Derivative [Line Items] |  |
Derivative assets liabilities at fair value net | $ (155,000) |
Volume Hedged | t_per_M | 5,000 |
[1] | Includes derivative instruments assumed in connection with the Memorial Merger.

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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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