Derivative Activities - Additional Information (Detail)	Mar. 31, 2016 USD ($) MMBTU / d MMBTU bbl t_per_M
Derivatives Excluding Basis Swaps
Derivative [Line Items]
Derivative assets liabilities at fair value net	$ 262,000,000
Natural Gas \| 2016 \| Swaps
Derivative [Line Items]
Volume Hedged \| MMBTU / d	760,000
Natural Gas \| 2017 \| Swaps
Derivative [Line Items]
Volume Hedged \| MMBTU / d	155,000
Natural Gas \| Basis Swaps
Derivative [Line Items]
Derivative assets liabilities at fair value net	$ 640,000
Volume Hedged \| MMBTU	52,360,000
Propane \| Spread Swaps
Derivative [Line Items]
Derivative assets liabilities at fair value net	$ 2,500,000
Propane \| Spread Swaps \| 2016
Derivative [Line Items]
Volume Hedged \| bbl	1,675,000
Propane \| Spread Swaps \| 2017
Derivative [Line Items]
Volume Hedged \| bbl	750,000
Freight \| Swaps \| Level 2
Derivative [Line Items]
Derivative assets liabilities at fair value net	$ (11,000)
Volume Hedged \| t_per_M	5,000

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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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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