Operating Segments - Schedule of Company's Asset by Operating Segment (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	$ 15,872,247	$ 16,155,672
Total assets	201,250,978	214,003,912
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	15,872,247	16,155,672
Total assets	303,236,811	324,004,500
Intersegment Elimination [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	(101,985,833)	(110,000,588)
Natural Gas Operations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	138,087,461	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	202,691,167	214,030,368
Natural Gas Operations [Member] | Intersegment Elimination [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	(64,603,706)	(68,714,744)
Marketing and Production [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	4,493,370	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	7,607,996	9,192,830
Marketing and Production [Member] | Intersegment Elimination [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	(3,114,626)	(2,714,405)
Corporate and Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	58,670,147	62,209,863
Corporate and Other [Member] | Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill	0	0
Total assets	92,937,648	100,781,302
Corporate and Other [Member] | Intersegment Elimination [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ (34,267,501)	$ (38,571,439)