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Acquisitions - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |
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Dec. 31, 2012 Eastern Shore Gas Company [Member] Customer | Dec. 31, 2012 Natural Gas Acquisition [Member] | Aug. 09, 2010 Natural Gas Acquisition [Member] Customer | Feb. 04, 2010 Propane Acquisitions [Member] Customer | Dec. 31, 2012 Propane Acquisitions [Member] Customer | Feb. 28, 2013 Propane Acquisitions [Member] Subsequent Event [Member] | Dec. 31, 2012 Propane Acquisitions [Member] Crescent Propane, Inc. (Crescent) and Barefoot Bay Propane Gas Company [Member]
Number of residential and commercial customers receiving propane gas distribution service | 11,000 |  |  |  | 3,000 |  |
Minimum number of customers to whom gas distribution systems and bulk delivery service provided | 500 |  |  |  |  |  |
Purchase price | $ 16,500,000 |  | $ 1,200,000 | $ 600,000 |  | $ 2,700,000 | $ 954,000
Number of retail customers |  |  | 700 | 1,000 |  |  |
Goodwill acquired due to merger |  | 742,000 |  |  |  |  | 200,000
Amortization period of merger cost |  | 15 years |  | 7 years |  |  |
Number of retail customers |  |  | 700 | 1,000 |  |  |
Purchase price | 16,500,000 |  | 1,200,000 | 600,000 |  | 2,700,000 | 954,000
Cash paid for acquisition |  |  |  | 300,000 |  |  |
Total value of consideration remaining amount to be paid |  |  |  | 300,000 |  |  |
Total value of consideration remaining amount payment term, months |  |  |  | 60 months |  |  |
Purchase price allocation of intangible assets |  |  |  | $ 188,000 |  |  |
Number of residential and commercial customers receiving propane gas distribution service | 11,000 |  |  |  | 3,000 |  |

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