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ORGANIZATION AND BASIS OF PRESENTATION (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
May 30, 2019
shares
May 28, 2019
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
segment
shares
Jun. 30, 2019
USD ($)
Jul. 31, 2020
shares
Dec. 31, 2019
shares
May 27, 2019
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 $ 1,296 $ 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) 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)   107,815,152 107,815,152     107,815,152  
Units outstanding (in shares)     107,815,152   107,815,152 107,815,152  
Diamondback Energy, Inc. | Class B Units              
Limited Partners' Capital Account [Line Items]              
Units outstanding (in 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%        
Rattler Midstream Partners LLC | Diamondback Energy, Inc.              
Limited Partners' Capital Account [Line Items]              
Limited partners, ownership interest     71.00%        
Equity Contribution Agreement              
Limited Partners' Capital Account [Line Items]              
Common units representing limited partner interests (in shares)             38,000,000