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Derivative Instruments - Additional Information (Detail) gal in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) Counterparty $ / gal gal | Dec. 31, 2014 USD ($) Counterparty $ / gal gal
Propane Swap Agreement [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Volume | gal | 2,500 | 630
Cash Paid On Derivative Settlement | $ 1,100,000 |
Other Comprehensive Income Loss Adjustments AOCI Swap Agreements |  | $ 735,000
Call options [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Volume | gal |  | 1,300
Payments for Derivative Instrument, Financing Activities |  | $ 98,000
Put Option [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Volume | gal | 2,500 | 630
Payments for Derivative Instrument, Financing Activities | $ 143,000 | $ 128,000
Cash Received On Derivative Settlement | $ 868,000 |
Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Number Of Counterparties With Master Repurchase Agreements | Counterparty | 2 | 2
Accounts Receivable Subject To Master Netting Arrangement | $ 654,000 | $ 1,600,000
Accounts Payable Subject To Master Netting Arrangement | 222,000 | $ 1,200,000
Mark To Market Energy Assets [Member] | Propane Swap Agreement [Member] |  |
Derivative [Line Items] |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | 36,000 |
Mark To Market Energy Liabilities [Member] | Propane Swap Agreement [Member] |  |
Derivative [Line Items] |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value | 38,000 |
Designated as Hedging Instrument [Member] | Mark To Market Energy Assets [Member] | Put Option [Member] |  |
Derivative [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 110,000 |
Strike Price 1 [Member] | Propane Swap Agreement [Member] |  |
Derivative [Line Items] |  |
Strike Price Per Gallon For The Propane Swap Agreements | $ / gal | 0.595 | 1.1350
Strike Price 2 [Member] | Propane Swap Agreement [Member] |  |
Derivative [Line Items] |  |
Strike Price Per Gallon For The Propane Swap Agreements | $ / gal | 0.5888 | 1.0975
Strike Price 3 [Member] | Propane Swap Agreement [Member] |  |
Derivative [Line Items] |  |
Strike Price Per Gallon For The Propane Swap Agreements | $ / gal | 0.5500 | 1.0475
Strike Price 4 [Member] | Propane Swap Agreement [Member] |  |
Derivative [Line Items] |  |
Strike Price Per Gallon For The Propane Swap Agreements | $ / gal | 0.5200 |
Put Option Strike Price 1 [Member] | Put Option [Member] |  |
Derivative [Line Items] |  |
Derivative, Price Risk Option Strike Price | $ / gal | 0.4950 | 1.0350
Put Option Strike Price 2 [Member] | Put Option [Member] |  |
Derivative [Line Items] |  |
Derivative, Price Risk Option Strike Price | $ / gal | 0.4888 | 0.9975
Put Option Strike Price 3 [Member] | Put Option [Member] |  |
Derivative [Line Items] |  |
Derivative, Price Risk Option Strike Price | $ / gal | 0.4500 | 0.9475
Put Option Strike Price 4 [Member] | Put Option [Member] |  |
Derivative [Line Items] |  |
Derivative, Price Risk Option Strike Price | $ / gal | 0.4200 |
Strike Price 1 [Member] | Call options [Member] |  |
Derivative [Line Items] |  |
Derivative, Price Risk Option Strike Price | $ / gal | 1.0875 |
Strike Price 2 [Member] | Call options [Member] |  |
Derivative [Line Items] |  |
Derivative, Price Risk Option Strike Price | $ / gal | 1.0650 |

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- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
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