QUARTERLY FINANCIAL DATA (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended												5 Months Ended	7 Months Ended	12 Months Ended
	Jun. 30, 2019	May 27, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	May 27, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	[1]	Dec. 31, 2017	[1]
Quarterly Financial Information Disclosure [Abstract]
Revenues			$ 125,308	$ 115,415	$ 111,774	$ 95,176	$ 51,503	$ 49,301	$ 49,788	$ 33,875							$ 447,673	$ 184,467		$ 39,295
Income from operations			61,042	52,558	55,602	50,138	19,557	22,672	21,020	17,070							211,972	80,319		25,353
Income tax expense			3,403	3,294	8,724	10,832	4,245	4,892	4,089	4,133					$ 18,182	$ 8,071	26,253	17,359		4,688
Net income	$ 20,040	$ 26,639	51,604	48,080	$ 46,679	$ 39,356	$ 15,312	$ 17,780	$ 15,472	$ 14,396	$ 9,396	$ 3,185	$ 5,146	$ 2,938	$ 65,995	119,724	$ 185,719	$ 62,960		$ 20,665
Net income attributable to non-controlling interest subsequent to initial public offering	15,237		39,136	36,549												90,922
Net income (loss) attributable to Rattler Midstream LP	$ 4,803		$ 12,468	$ 11,531												$ 28,802
Net income (loss) attributable to limited partners per common unit:
Basic (in dollars per share)			$ 0.27	$ 0.26	$ 0.11											$ 0.64
Diluted (in dollars per share)			$ 0.27	$ 0.26	$ 0.11											$ 0.64

[1] See Note 1 for information regarding the basis of financial statement presentation.