Derivative Financial Instruments (Schedule of Derivative Instruments) (Detail) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Unrealized loss on commodity swap contracts not designated as hedging instruments		$ 1,446,281	$ 0	$ 2,703,080	$ 0
Deferred unrealized loss on commodity swap contracts	[1]	(1,433,448)	0	(2,567,960)	0
Unrealized gain included in Other income, net		$ 12,833	$ 0	$ 135,120	$ 0

[1] Unrealized losses on commodity swap agreements incurred by the Company’s regulated subsidiaries have been deferred as a regulatory asset on the Company’s Condensed Consolidated Balance Sheet. See Note 6 - Regulatory Assets and Liabilities.