Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended									12 Months Ended								12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2012	Dec. 31, 2013 Regulated Energy	Dec. 31, 2012 Regulated Energy	Dec. 31, 2013 Unregulated Energy	Dec. 31, 2012 Unregulated Energy	Oct. 31, 2009 FPU Regulated Energy	Dec. 31, 2013 Indiantown Gas Company Regulated Energy	Aug. 30, 2010 Indiantown Gas Company Regulated Energy	Dec. 02, 2013 Fort Meade	Aug. 30, 2010 Fort Meade	Dec. 31, 2011 Crescent Propane Inc Unregulated Energy	Dec. 31, 2013 Sharp Energy Inc Unregulated Energy	Dec. 31, 2013 Glades	Jun. 07, 2013 Austin Cox	Dec. 31, 2013 Virginia LP Gas, Inc. Maximum	Dec. 31, 2013 Customer list Minimum	Dec. 31, 2013 Customer list Maximum	Dec. 31, 2013 Non-Compete Agreements
Goodwill [Line Items]
Goodwill	$ 4,354	$ 4,090		$ 200	$ 2,790	$ 3,216	$ 1,564	$ 874	$ 2,500	$ 746	$ 170	$ 150	$ 150	$ 200	$ 674	$ 453	$ 237
Regulatory assets										576
Amortized period of acquired intangible assets																		40 years	7 years	12 years	7 years
Amortization of intangible assets	373	329	332
Amortization of intangible assets, 2014	400
Amortization of intangible assets, 2015	400
Amortization of intangible assets, 2016	375
Amortization of intangible assets, 2017	373
Amortization of intangible assets, 2018	$ 344