Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Total	Class A Common Stock	Class B Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Accumulated Deficit	Total Earthstone Energy, Inc. Equity	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2019				29,421,131	35,260,680
Beginning balance at Dec. 31, 2019	$ 835,751			$ 29	$ 35	$ 527,246	$ (181,711)	$ 345,599	$ 490,152
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2,694					2,694		2,694
Vesting of restricted stock units and performance units, net of taxes paid (in shares)				231,834
Vesting of restricted stock units and performance units, net of taxes paid	1			$ 1				1
Vested restricted stock units and performance units retained by the Company in exchange for payment of recipient mandatory tax withholdings (in shares)				75,695
Vested restricted stock units and performance units retained by the Company in exchange for payment of recipient mandatory tax withholdings	(214)					(214)		(214)
Cancellation of treasury shares (in shares)				(75,695)
Class B Common Stock converted to Class A Common Stock (in shares)				199,993	(199,993)
Class B Common Stock converted to Class A Common Stock	0					2,897		2,897	(2,897)
Net income (loss)	36,714						16,708	16,708	20,006
Ending balance (in shares) at Mar. 31, 2020				29,852,958	35,060,687
Ending balance at Mar. 31, 2020	874,946			$ 30	$ 35	532,623	(165,003)	367,685	507,261
Beginning balance (in shares) at Dec. 31, 2019				29,421,131	35,260,680
Beginning balance at Dec. 31, 2019	835,751			$ 29	$ 35	527,246	(181,711)	345,599	490,152
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Class B Common Stock converted to Class A Common Stock (in shares)			251,309
Net income (loss)	(11,053)
Ending balance (in shares) at Sep. 30, 2020				30,210,749	35,009,371
Ending balance at Sep. 30, 2020	831,833			$ 30	$ 35	537,990	(186,787)	351,268	480,565
Beginning balance (in shares) at Mar. 31, 2020				29,852,958	35,060,687
Beginning balance at Mar. 31, 2020	874,946			$ 30	$ 35	532,623	(165,003)	367,685	507,261
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2,568					2,568		2,568
Vesting of restricted stock units and performance units, net of taxes paid (in shares)		165,399
Vested restricted stock units and performance units retained by the Company in exchange for payment of recipient mandatory tax withholdings (in shares)				57,810
Vested restricted stock units and performance units retained by the Company in exchange for payment of recipient mandatory tax withholdings	(170)					(170)		(170)
Cancellation of treasury shares (in shares)				(57,810)
Class B Common Stock converted to Class A Common Stock (in shares)				2,000	(2,000)
Class B Common Stock converted to Class A Common Stock	0					28		28	(28)
Net income (loss)	(35,909)						(16,339)	(16,339)	(19,570)
Ending balance (in shares) at Jun. 30, 2020				30,020,357	35,058,687
Ending balance at Jun. 30, 2020	841,435			$ 30	$ 35	535,049	(181,342)	353,772	487,663
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2,403					2,403		2,403
Vesting of restricted stock units and performance units, net of taxes paid (in shares)		141,076
Vested restricted stock units and performance units retained by the Company in exchange for payment of recipient mandatory tax withholdings (in shares)				54,268
Vested restricted stock units and performance units retained by the Company in exchange for payment of recipient mandatory tax withholdings	(147)					(147)		(147)
Cancellation of treasury shares (in shares)				(54,268)
Class B Common Stock converted to Class A Common Stock (in shares)			49,316	49,316	(49,316)
Class B Common Stock converted to Class A Common Stock	0					685		685	(685)
Net income (loss)	(11,858)						(5,445)	(5,445)	(6,413)
Ending balance (in shares) at Sep. 30, 2020				30,210,749	35,009,371
Ending balance at Sep. 30, 2020	831,833			$ 30	$ 35	537,990	(186,787)	351,268	480,565
Beginning balance (in shares) at Dec. 31, 2020				30,343,421	35,009,371
Beginning balance at Dec. 31, 2020	815,536			$ 30	$ 35	540,074	(195,258)	344,881	470,655
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2,605					2,605		2,605
Shares issued in connection with Acquisition (in shares)				12,719,594
Shares issued in connection with Acquisition	76,572			$ 13		76,559		76,572
Vesting of restricted stock units and performance units, net of taxes paid (in shares)				463,495
Vested restricted stock units and performance units retained by the Company in exchange for payment of recipient mandatory tax withholdings (in shares)				257,764
Vested restricted stock units and performance units retained by the Company in exchange for payment of recipient mandatory tax withholdings	(2,080)					(2,080)		(2,080)
Cancellation of treasury shares (in shares)				(257,764)
Class B Common Stock converted to Class A Common Stock (in shares)				578,031	(578,031)
Class B Common Stock converted to Class A Common Stock	0			$ 1	$ (1)	7,758		7,758	(7,758)
Net income (loss)	(10,556)						(5,833)	(5,833)	(4,723)
Ending balance (in shares) at Mar. 31, 2021				44,104,541	34,431,340
Ending balance at Mar. 31, 2021	882,077			$ 44	$ 34	624,916	(201,091)	423,903	458,174
Beginning balance (in shares) at Dec. 31, 2020				30,343,421	35,009,371
Beginning balance at Dec. 31, 2020	815,536			$ 30	$ 35	540,074	(195,258)	344,881	470,655
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Class B Common Stock converted to Class A Common Stock (in shares)			655,376
Net income (loss)	(7,549)
Ending balance (in shares) at Sep. 30, 2021				50,692,057	34,353,995
Ending balance at Sep. 30, 2021	949,894			$ 51	$ 34	690,739	(199,544)	491,280	458,614
Beginning balance (in shares) at Mar. 31, 2021				44,104,541	34,431,340
Beginning balance at Mar. 31, 2021	882,077			$ 44	$ 34	624,916	(201,091)	423,903	458,174
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2,175					2,175		2,175
Vesting of restricted stock units and performance units, net of taxes paid (in shares)				155,058
Vested restricted stock units and performance units retained by the Company in exchange for payment of recipient mandatory tax withholdings (in shares)				66,343
Vested restricted stock units and performance units retained by the Company in exchange for payment of recipient mandatory tax withholdings	(741)					(741)		(741)
Cancellation of treasury shares (in shares)				(66,343)
Class B Common Stock converted to Class A Common Stock (in shares)				33,463	(33,463)
Class B Common Stock converted to Class A Common Stock	0					441		441	(441)
Net income (loss)	(15,831)						(8,871)	(8,871)	(6,960)
Ending balance (in shares) at Jun. 30, 2021				44,293,062	34,397,877
Ending balance at Jun. 30, 2021	867,680			$ 44	$ 34	626,791	(209,962)	416,907	450,773
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	2,161					2,161		2,161
Shares issued in connection with Acquisition (in shares)				6,200,000
Shares issued in connection with Acquisition	61,814			$ 6		61,808		61,814
Vesting of restricted stock units and performance units, net of taxes paid (in shares)				155,113
Vesting of restricted stock units and performance units, net of taxes paid	0			$ 1		(1)
Vested restricted stock units and performance units retained by the Company in exchange for payment of recipient mandatory tax withholdings (in shares)				65,106
Vested restricted stock units and performance units retained by the Company in exchange for payment of recipient mandatory tax withholdings	(599)					(599)		(599)
Cancellation of treasury shares (in shares)				(65,106)
Class B Common Stock converted to Class A Common Stock (in shares)			43,882	43,882	(43,882)
Class B Common Stock converted to Class A Common Stock	0					579		579	(579)
Net income (loss)	18,838						10,418	10,418	8,420
Ending balance (in shares) at Sep. 30, 2021				50,692,057	34,353,995
Ending balance at Sep. 30, 2021	$ 949,894			$ 51	$ 34	$ 690,739	$ (199,544)	$ 491,280	$ 458,614