| Cover Page | Aug. 05, 2020 | Aug. 04, 2020 |
| Cover [Abstract] | ||
| Document Type | 8-K/A | |
| Document Period End Date | Aug. 5, 2020 | |
| Entity Registrant Name | OASIS MIDSTREAM PARTNERS LP | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-38212 | |
| Entity Tax Identification Number | 47-1208855 | |
| Entity Address, Address Line One | 1001 Fannin Street | |
| Entity Address, Address Line Two | Suite 1500 | |
| Entity Address, City or Town | Houston | |
| Entity Address, State or Province | TX | |
| Entity Address, Postal Zip Code | 77002 | |
| City Area Code | 281 | |
| Local Phone Number | 404-9500 | |
| Title of 12(b) Security | Common units representing limited partner interests | |
| Trading Symbol | OMP | |
| Security Exchange Name | NASDAQ | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Entity Emerging Growth Company | true | |
| Entity Ex Transition Period | true | |
| Entity Central Index Key | 0001652133 | |
| Amendment Flag | true | |
| Amendment Description | The purpose of this amendment to the Current Report on Form 8-K/A (the “Form 8-K/A”) filed by Oasis Midstream Partners LP ( the “Partnership” or “OMP”) with the Securities and Exchange Commission on August 5, 2020 (the “Form 8-K”), is to add Inline eXtensible Business Reporting Language (“iXBRL”) tagging to the cover page of this Form 8-K/A and to furnish Exhibit 104 to this Form 8-K/A relating to the same. |
