STOCKHOLDERS' EQUITY AND PARTNERS' CAPITAL (Details)	11 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($) shares	Dec. 31, 2019 director vote $ / shares shares	Dec. 31, 2018 USD ($) shares	Aug. 31, 2018 USD ($)
Class of Warrant or Right [Line Items]
Voting percentage for election of directors		50.00%
Number of directors that may be elected (director) | director		5
Share repurchase program, authorized amount | $				$ 50,000,000.0
Price paid for the shares repurchased | $	$ 14,750,000
Warrants outstanding (in shares)		62,966,651
Noncontrolling interest		55.80%
Public Warrants
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)		34,499,985
Number of shares called by each warrant (in shares)		1
Warrant exercise price per share (in dollars per share) | $ / shares		$ 11.50
Private Placement
Class of Warrant or Right [Line Items]
Warrants issued (in shares)		15,133,333
Forward Purchase Warrants
Class of Warrant or Right [Line Items]
Shares issued during period (in shares)		13,333,333
SRII Opco, LP
Class of Warrant or Right [Line Items]
Noncontrolling interest	53.00%	52.25%	53.00%
Paid-In Capital
Class of Warrant or Right [Line Items]
Price paid for the shares repurchased | $	$ 25,589,000
Common Class A
Class of Warrant or Right [Line Items]
Number of votes for each share of common stock (votes) | vote		1
Shares sold (in shares)			3,101,510
Common stock, shares outstanding (in shares)	180,072,227	182,774,952	180,072,227
Common Class A | Alta Mesa Contributor
Class of Warrant or Right [Line Items]
Conversion of common shares (in shares)	2,752,312	2,181,600
Common Class A | Kingfisher Contributor
Class of Warrant or Right [Line Items]
Conversion of common shares (in shares)	9,588,764
Common Class A | SRII Opco, LP
Class of Warrant or Right [Line Items]
Adjustment to additional paid in capital | $	$ 10,800,000
Common Class A | Alta Mesa Holdings GP, LLC
Class of Warrant or Right [Line Items]
Percentage of economic interest held		100.00%
Common Class A | Paid-In Capital
Class of Warrant or Right [Line Items]
Price paid for the shares repurchased | $			$ 14,800,000
Common Class C
Class of Warrant or Right [Line Items]
Shares issued during period (in shares)		213,402,398
Common stock, shares outstanding (in shares)	202,169,576	199,987,976	202,169,576
Common Class C | Kingfisher Contributor
Class of Warrant or Right [Line Items]
Conversion of common shares (in shares)	12,341,076	2,181,600
Preferred Class A
Class of Warrant or Right [Line Items]
Number of directors that may be elected (director) | director		2
Preferred stock, shares outstanding (in shares)	2	2	2
Period for election of directors		5 years
Preferred Class A | Bayou City
Class of Warrant or Right [Line Items]
Preferred stock, shares outstanding (in shares)		1
Preferred Class B
Class of Warrant or Right [Line Items]
Number of directors that may be elected (director) | director		3
Preferred stock, shares outstanding (in shares)	1	1	1
Period for election of directors		5 years
Common Class B | Alta Mesa Holdings GP, LLC
Class of Warrant or Right [Line Items]
Percentage of voting interest held		100.00%
Common Class B | Alta Mesa Holdings GP, LLC | SRII Opco, LP
Class of Warrant or Right [Line Items]
Percentage of economic interest held		90.00%
Percentage of voting interest held		10.00%