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Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended
Acquisitions - Additional Information (Detail) (USD $)	Mar. 31, 2013 Customer	Feb. 05, 2013
Eastern Shore Gas Company [Member]
Number of residential and commercial customers receiving propane gas distribution service	11,000
Minimum number of customers to whom gas distribution systems and bulk delivery service provided	500
Purchase price	16,500,000
Propane Acquisition [Member]
Number of residential and commercial customers receiving propane gas distribution service	3,000
Purchase price		2,900,000
Purchase price allocated to property, plant and equipment		1,600,000
Purchase price allocated to propane and other inventory		502,000
Purchase price allocated to intangible assets related to customer list		300,000
Purchase price allocated to goodwill		$ 453,000

The amount of identifiable intangible assets recognized as of the acquisition date.

The amount of inventory recognized as of the acquisition date.

The amount of property, plant, and equipment recognized as of the acquisition date.