EARNINGS PER COMMON UNIT (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income (loss) attributable to Rattler Midstream LP	$ 9,218	$ 11,531	$ 25,071	$ 16,334
Less: net income allocated to participating securities	(524)	0	(1,820)	0
Net income (loss) attributable to common unitholders	$ 8,694	$ 11,531	$ 23,251	$ 16,334
Basic weighted average common units outstanding (in shares)	43,996,000	43,700,000	43,837,000	43,564,000
Potential common units issuable (in shares)	0	1,136,000	0	1,146,000
Diluted weighted average common units outstanding (in shares)	43,996,000	44,836,000	43,837,000	44,710,000
Net income per common unit, basic (in USD per share)	$ 0.20	$ 0.26	$ 0.53	$ 0.37
Net income per common unit, diluted (in USD per share)	$ 0.20	$ 0.26	$ 0.53	$ 0.37
Phantom units (in shares)	0		0