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Partnership Units and Related Matters - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 30, 2019
Oct. 31, 2015
Mar. 31, 2019
Mar. 31, 2018
Limited Partners Capital Account [Line Items]        
Capital contributions to partnership     $ 0  
Preferred unit, issued   5,000,000    
Distributions from partnership     2,800,000 $ 2,800,000
Subsequent Event [Member]        
Limited Partners Capital Account [Line Items]        
Distributions declaration month 2019-04      
Distribution declared $ 0.1875      
Distributions from partnership $ 900,000      
Distributions payable date May 15, 2019      
Series A Preferred Units due November 1, 2020 [Member] | London Interbank Offered Rate (LIBOR)        
Limited Partners Capital Account [Line Items]        
Percentage of variable interest rate for distribution on preferred units upon maturity   7.71%    
Series A Preferred Units [Member]        
Limited Partners Capital Account [Line Items]        
Preferred unit, dividend interest rate   9.00%    
Series A Cumulative Redeemable Perpetual Preferred Units [Member]        
Limited Partners Capital Account [Line Items]        
Distribution to preferred unitholders     $ 2,800,000  
Holders of Limited Partner Interests [Member]        
Limited Partners Capital Account [Line Items]        
Limited partner capital contribution allocation percentage     98.00%  
Targa Resources Genaral Partner LLC [Member]        
Limited Partners Capital Account [Line Items]        
General partner capital contribution allocation percentage     2.00%