ORGANIZATION AND BASIS OF PRESENTATION (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	May 30, 2019 shares	May 28, 2019 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) segment shares	Dec. 31, 2018 USD ($) shares		Dec. 31, 2017 USD ($)	[1]	Feb. 14, 2020 shares
Limited Partners' Capital Account [Line Items]
Cash contribution from Diamondback | $		$ 1,000
Cash contribution from the general partner | $		1,000
Payments of distributions to affiliates | $		$ 726,500	$ 751	$ 0	[1]	$ 0
General partners capital account, percentage of preferred cash distribution received		8.00%
Number of operating segments | segment			2
Over-Allotment Option
Limited Partners' Capital Account [Line Items]
Number of shares issued (in shares) | shares	5,700,000
IPO
Limited Partners' Capital Account [Line Items]
Shares price (in dollars per share) | $ / shares		$ 17.50
Net proceeds received from sale of common units | $		$ 719,400
Class B Units
Limited Partners' Capital Account [Line Items]
Common units issued (in shares) | shares		107,815,152	107,815,152	0
Units outstanding (in shares) | shares		0	107,815,152	0				107,815,152
Diamondback Energy, Inc. | Class B Units
Limited Partners' Capital Account [Line Items]
Units outstanding (in shares) | shares			107,815,152
Rattler MIdstream LP
Limited Partners' Capital Account [Line Items]
Limited partners, ownership interest		71.00%
General partners, ownership interest			100.00%
Rattler MIdstream LP | Diamondback Energy, Inc.
Limited Partners' Capital Account [Line Items]
Limited partners, ownership interest			71.00%
Rattler Midstream Partners LLC
Limited Partners' Capital Account [Line Items]
General partners, ownership interest		29.00%	29.00%
Rattler Midstream Partners LLC | Diamondback Energy, Inc.
Limited Partners' Capital Account [Line Items]
Limited partners, ownership interest			71.00%

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