Derivative Activities - Additional Information (Detail) $ in Millions	Dec. 31, 2019 USD ($) t_per_M MMBTU
Derivatives Excluding Basis Swaps And Freight Swaps
Derivative [Line Items]
Derivative assets liabilities at fair value net	$ 126.7
Commodity \| Natural Gas Basis Swaps
Derivative [Line Items]
Derivative assets liabilities at fair value net	$ 9.4
Volume Hedged \| MMBTU	114,882,500
Commodity \| Propane Spread Swaps
Derivative [Line Items]
Derivative assets liabilities at fair value net	$ 14.1
Freight \| Swaps \| Level 2
Derivative [Line Items]
Derivative assets liabilities at fair value net	$ 1.5
Freight \| Swaps \| Contracts Settle in First Quarter 2020 \| Level 2
Derivative [Line Items]
Volume Hedged \| t_per_M	4,000
Freight \| Swaps \| Contracts Settle for Remainder of 2020 \| Level 2
Derivative [Line Items]
Volume Hedged \| t_per_M	14,000
Freight \| Swaps \| Contracts Settle in 2021 \| Level 2
Derivative [Line Items]
Volume Hedged \| t_per_M	10,000

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.

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958

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- Definition

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

No definition available.

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- Definition

Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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