Operating Segments - Schedule of Company's Asset by Operating Segment (Detail) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	$ 15,872,247	$ 16,155,672
Total assets	195,158,097	214,003,912
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	15,872,247	16,155,672
Total assets	307,309,266	324,004,500
Intersegment Elimination [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	(112,151,169)	(110,000,588)
Natural Gas Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	183,405,392	145,315,624
Natural Gas Operations [Member] | Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	14,496,247	14,779,672
Total assets	207,865,565	214,030,368
Natural Gas Operations [Member] | Intersegment Elimination [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	(24,460,173)	(68,714,744)
Marketing and Production [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	8,013,050	6,478,425
Marketing and Production [Member] | Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	1,376,000	1,376,000
Total assets	8,234,003	9,192,830
Marketing and Production [Member] | Intersegment Elimination [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	(220,953)	(2,714,405)
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,739,655	62,209,863
Corporate and Other [Member] | Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	0	0
Total assets	91,209,698	100,781,302
Corporate and Other [Member] | Intersegment Elimination [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ (87,470,043)	$ (38,571,439)