Basis of Presentation - Additional Information (Details)		9 Months Ended
	Dec. 19, 2014 Subsidiary shares	Sep. 30, 2015 shares
Oak Valley Resources, Limited Liability Company [Member]
Basis Of Presentation [Line Items]
Number of subsidiaries acquired | Subsidiary	3
Common stock shares issued in exchange for acquisition	9,124,452
Percentage of common stock acquired	84.00%	66.00%
Flatonia Energy, LLC [Member]
Basis Of Presentation [Line Items]
Additional ownership interest acquired in certain oil and gas properties		20.00%
Common stock shares issued in exchange for acquisition		2,957,000
Undivided ownership interest percentage before acquisition		30.00%
Undivided ownership interest percentage after acquisition		50.00%