EARNINGS PER COMMON UNIT (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income attributable to Rattler Midstream LP	$ 2,822	$ 4,803	$ 15,853	$ 4,803
Less: net income allocated to participating securities	(644)	0	(1,296)	0
Net income attributable to common unitholders	$ 2,178	$ 4,803	$ 14,557	$ 4,803
Basic weighted average common units outstanding (in shares)	43,812,000	43,197,000	43,756,000	43,197,000
Potential common units issuable (in shares)	0	1,143,000	0	1,143,000
Diluted weighted average common units outstanding (in shares)	43,812,000	44,340,000	43,756,000	44,340,000
Net income per common unit, basic (in USD per share)	$ 0.05	$ 0.11	$ 0.33	$ 0.11
Net income per common unit, diluted (in USD per share)	$ 0.05	$ 0.11	$ 0.33	$ 0.11
Phantom units (in shares)	0		0