UNITHOLDERS’ EQUITY AND PARTNERSHIP DISTRIBUTIONS (Details) - USD ($)	1 Months Ended	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jul. 31, 2020	Apr. 30, 2020	Feb. 13, 2020	Dec. 31, 2019	Oct. 31, 2019	May 28, 2019
Limited Partners' Capital Account [Line Items]
Net income attributable to Rattler Midstream LP		$ 2,822,000		$ 4,803,000	$ 15,853,000	$ 4,803,000
Change in ownership of consolidated subsidiaries		90,613,000			90,600,000
Limited Partners
Limited Partners' Capital Account [Line Items]
Net income attributable to Rattler Midstream LP		2,822,000			15,853,000
Change in ownership of consolidated subsidiaries	$ 0	(329,034,000)			(329,034,000)
Change from net (loss) income attributable to the Partnership's unitholders and transfers to non-controlling interest		$ (326,212,000)			$ (313,181,000)
Rattler Midstream Partners LLC
Limited Partners' Capital Account [Line Items]
Conversion of stock, shares converted					1
Rattler Midstream Partners LLC | Diamondback Energy, Inc.
Limited Partners' Capital Account [Line Items]
Limited partners, ownership interest					71.00%
Common Units
Limited Partners' Capital Account [Line Items]
Common units issued (in shares)		43,996,243			43,996,243					43,700,000
Units outstanding (in shares)		43,996,243			43,996,243					43,700,000
Conversion of stock, shares issued					1
Partners' capital, cash distribution (in USD per common unit)			$ 0.25					$ 0.29	$ 0.29		$ 0.34
Partners' capital, cash distribution, period of record date after quarter end			60 days
Common Units | Subsequent Event
Limited Partners' Capital Account [Line Items]
Partners' capital, cash distribution (in USD per common unit)							$ 0.29
Common Units | Diamondback Energy, Inc.
Limited Partners' Capital Account [Line Items]
Units outstanding (in shares)		0			0
Class B Units
Limited Partners' Capital Account [Line Items]
Common units issued (in shares)		107,815,152			107,815,152					107,815,152		107,815,152
Units outstanding (in shares)		107,815,152			107,815,152		107,815,152			107,815,152
Conversion of stock, shares converted					1
Class B Units | Diamondback Energy, Inc.
Limited Partners' Capital Account [Line Items]
Units outstanding (in shares)		107,815,152			107,815,152