Net Income (Loss) Per Common Share - Reconciliation of Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income (loss) attributable to Earthstone Energy, Inc.	$ 42,325	$ (12,514)
Net income (loss) per common share attributable to Earthstone Energy, Inc.:
Basic (in dollars per share)	$ 1.50	$ (0.53)
Diluted (in dollars per share)	$ 1.50	$ (0.53)
Weighted average common shares outstanding
Basic (in shares)	28,153,885	23,589,973
Add potentially dilutive securities:
Unvested restricted stock units	63,889	0
Diluted weighted average common shares outstanding	28,217,774	23,589,973