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Derivative Instruments - Additional Information (Detail) (USD $) |  | 1 Months Ended | 12 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Aug. 30, 2011 Put Option [Member] gal | Dec. 31, 2012 Put Option [Member] | May 31, 2012 Call options [Member] gal | Dec. 31, 2012 Call options [Member] | Dec. 31, 2012 Call options [Member] Minimum [Member] | Dec. 31, 2012 Call options [Member] Maximum [Member]
Derivative [Line Items] |  |  |  |  |  |  |
Purchase quantity for propane price cap |  | 630,000 |  | 1,260,000 |  |  |
Strike price of put option | 1.445 |  | 1.445 |  |  | 0.905 | 0.990
Payment to purchase call options |  |  |  | $ 139,000 |  |  |
Fair value of call options |  |  |  |  | 28,000 |  |
Ineffective portion of this fair value hedge |  |  |  |  | 0 |  |
Difference between market price and strike price |  |  | 118,000 |  |  |  |
Amount paid to purchase put option |  |  | $ 91,000 |  |  |  |

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