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Partnership Equity and Distributions (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Feb. 05, 2019
Nov. 14, 2018
Sep. 25, 2017
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Distribution Made to Limited Partner [Line Items]                          
Proceeds from initial public offering, net of offering costs                     $ 0 $ 134,200 $ 0
Proceeds from sale of common units, net of offering costs                     44,503 0 $ 0
Quarterly cash distribution declared (in usd per share       $ 0.45 $ 0.43 $ 0.41 $ 0.3925 $ 0.375 $ 0.0245        
Distribution declared                     49,247 10,991  
General Partner                          
Distribution Made to Limited Partner [Line Items]                          
Distribution declared       $ 100 $ 0 $ 0 $ 0 $ 0 $ 0   $ 112 0  
Cash Distribution                          
Distribution Made to Limited Partner [Line Items]                          
Partners periodic distribution (in dollars per share)       $ 0.375                  
Target annualized distributions (in usd per unit)                     $ 1.50    
Termination threshold as percentage of sum of minimum distribution multiplied by total number of units outstanding (percent)                   150.00% 50.00%    
Basis for General Partners' interest in distributions (in dollars per share)                     $ 0.43125    
Cash Distribution | Target Distribution up to $0.375                          
Distribution Made to Limited Partner [Line Items]                          
Partners periodic distribution (in dollars per share)                     0.375    
Cash Distribution | Target Distribution above $0.375 up to $0.4313 | Minimum                          
Distribution Made to Limited Partner [Line Items]                          
Partners periodic distribution (in dollars per share)                     0.375    
Cash Distribution | Target Distribution above $0.375 up to $0.4313 | Maximum                          
Distribution Made to Limited Partner [Line Items]                          
Partners periodic distribution (in dollars per share)                     0.4313    
Cash Distribution | Target Distribution above $0.4313 up to $0.4688 | Minimum                          
Distribution Made to Limited Partner [Line Items]                          
Partners periodic distribution (in dollars per share)                     0.4313    
Cash Distribution | Target Distribution above $0.4313 up to $0.4688 | Maximum                          
Distribution Made to Limited Partner [Line Items]                          
Partners periodic distribution (in dollars per share)                     0.4688    
Cash Distribution | Target Distribution above $$0.4688 up to 0.5625 | Minimum                          
Distribution Made to Limited Partner [Line Items]                          
Partners periodic distribution (in dollars per share)                     0.4688    
Cash Distribution | Target Distribution above $$0.4688 up to 0.5625 | Maximum                          
Distribution Made to Limited Partner [Line Items]                          
Partners periodic distribution (in dollars per share)                     0.5625    
Cash Distribution | Target Distribution above $0.5625 | Minimum                          
Distribution Made to Limited Partner [Line Items]                          
Partners periodic distribution (in dollars per share)                     $ 0.5625    
Cash Distribution | Oasis | Target Distribution up to $0.375                          
Distribution Made to Limited Partner [Line Items]                          
Marginal percentage interest in distributions (percent)       100.00%             100.00%    
Cash Distribution | Oasis | Target Distribution above $0.375 up to $0.4313                          
Distribution Made to Limited Partner [Line Items]                          
Marginal percentage interest in distributions (percent)       100.00%             100.00%    
Cash Distribution | Oasis | Target Distribution above $0.4313 up to $0.4688                          
Distribution Made to Limited Partner [Line Items]                          
Marginal percentage interest in distributions (percent)       85.00%             85.00%    
Cash Distribution | Oasis | Target Distribution above $$0.4688 up to 0.5625                          
Distribution Made to Limited Partner [Line Items]                          
Marginal percentage interest in distributions (percent)       75.00%             75.00%    
Cash Distribution | Oasis | Target Distribution above $0.5625                          
Distribution Made to Limited Partner [Line Items]                          
Marginal percentage interest in distributions (percent)       50.00%             50.00%    
Cash Distribution | General Partner | Target Distribution up to $0.375                          
Distribution Made to Limited Partner [Line Items]                          
Marginal percentage interest in distributions (percent)       0.00%             0.00%    
Cash Distribution | General Partner | Target Distribution above $0.375 up to $0.4313                          
Distribution Made to Limited Partner [Line Items]                          
Marginal percentage interest in distributions (percent)       0.00%             0.00%    
Cash Distribution | General Partner | Target Distribution above $0.4313 up to $0.4688                          
Distribution Made to Limited Partner [Line Items]                          
Marginal percentage interest in distributions (percent)       15.00%             15.00%    
Cash Distribution | General Partner | Target Distribution above $$0.4688 up to 0.5625                          
Distribution Made to Limited Partner [Line Items]                          
Marginal percentage interest in distributions (percent)       25.00%             25.00%    
Cash Distribution | General Partner | Target Distribution above $0.5625                          
Distribution Made to Limited Partner [Line Items]                          
Marginal percentage interest in distributions (percent)       50.00%             50.00%    
Subsequent Event                          
Distribution Made to Limited Partner [Line Items]                          
Quarterly cash distribution declared (in usd per share $ 0.45                        
Common Units                          
Distribution Made to Limited Partner [Line Items]                          
Common units sold in public offering (shares)     7,500                    
Price of common units sold (in usd per share)     $ 17                    
Common Units | Oasis                          
Distribution Made to Limited Partner [Line Items]                          
Distribution declared       $ 9,020 5,925 5,649 5,406 5,161 337   $ 26,001 5,498  
Subordinated Units | Oasis                          
Distribution Made to Limited Partner [Line Items]                          
Distribution declared       $ 6,188 $ 5,913 $ 5,638 $ 5,397 $ 5,156 $ 337   $ 23,134 $ 5,493  
Over-Allotment Option | Common Units                          
Distribution Made to Limited Partner [Line Items]                          
Common units sold in public offering (shares)     1,125                    
Oasis Midstream Partners, LP | Partnership Interest | Common Units                          
Distribution Made to Limited Partner [Line Items]                          
Common units sold in public offering (shares)   2,300                      
Price of common units sold, net of underwriting discounts and commission (in usd per share)   $ 20                      
Oasis Midstream Partners, LP | Partnership Interest | Over-Allotment Option | Common Units                          
Distribution Made to Limited Partner [Line Items]                          
Common units sold in public offering (shares)   300