Derivative Activities - Additional Information (Detail)	Jun. 30, 2017 USD ($) t_per_M MMBTU bbl
Derivatives Excluding Basis Swaps and Freight Swaps
Derivative [Line Items]
Derivative assets liabilities at fair value net	$ 99,800,000
Commodity \| Basis Swaps \| Natural Gas
Derivative [Line Items]
Derivative assets liabilities at fair value net	$ (10,500,000)
Volume Hedged \| MMBTU	71,212,500
Commodity \| Spread Swaps \| Propane
Derivative [Line Items]
Derivative assets liabilities at fair value net	$ 2,600,000
Commodity \| Swaps \| Freight
Derivative [Line Items]
Derivative assets liabilities at fair value net	$ 109,000
Volume Hedged \| t_per_M	5,000
2017 Commodity Contract \| Spread Swaps \| Propane
Derivative [Line Items]
Volume Hedged \| bbl	910,500
2018 Commodity Contract \| Spread Swaps \| Propane
Derivative [Line Items]
Volume Hedged \| bbl	750,000

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

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

No definition available.

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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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- 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.

+ References

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