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Derivative Instruments - Effects of Gains and Losses from Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) on derivatives | $ (352) | $ 18 | $ 116
Cost of Sales [Member] | Derivatives designated as fair value hedges [Member] | Put Option [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) on derivatives | 27 |  |
Cost of Sales [Member] | Derivatives not designated as hedging instruments [Member] | Put Option [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) on derivatives |  |  | (168)
Propane Inventory [Member] | Derivatives designated as fair value hedges [Member] | Put/Call Option [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) on derivatives | (40) | (23) |
Revenue [Member] | Forward Contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) on derivatives | (339) | 41 | 284
Revenue [Member] | Derivatives not designated as hedging instruments [Member] | Forward Contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) on derivatives | $ (339) | $ 41 | $ 284

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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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