EARNINGS PER COMMON UNIT (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended			7 Months Ended
	Jun. 30, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2019
Earnings Per Share, Basic [Abstract]
Net income attributable to Rattler Midstream LP	$ 4,803	$ 12,468	$ 11,531		$ 28,802
Less: net income allocated to participating securities					(751)
Net income attributable to common unitholders					$ 28,051
Basic weighted average common units outstanding (in shares)					43,622
Diluted weighted average common units outstanding (in shares)					43,622
Net income per common unit, basic (in USD per share)		$ 0.27	$ 0.26	$ 0.11	$ 0.64
Net income per common unit, diluted (in USD per share)		$ 0.27	$ 0.26	$ 0.11	$ 0.64
Effect of dilutive securities:
Phantom units (in shares)					44