Acquisitions and Divestitures - Schedule of Unaudited Pro forma Revenues and Expenses of Assets Acquired and Liabilities Assumed (Details) - Earthstone Energy Reverse Acquisition 2014 Eagle Ford Acquisition [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
Business Acquisition [Line Items]
Revenue	$ 22,691	$ 65,652
Income before taxes	10,506	26,340
Net income available to Earthstone common stockholders	$ 6,832	$ 17,256
Pro forma net income per common share:
Basic and diluted	$ 0.49	$ 1.25