Subsequent Events - Narrative (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Feb. 22, 2019	Dec. 31, 2018	Dec. 31, 2019
Oasis Midstream Partners, LP | Beartooth DevCo
Subsequent Event [Line Items]
Ownership interest (percent)		70.00%
Oasis Midstream Partners, LP | Bobcat DevCo
Subsequent Event [Line Items]
Ownership interest (percent)		25.00%
Minimum | Expects | Oasis Midstream Partners, LP | Bobcat DevCo
Subsequent Event [Line Items]
Ownership interest (percent)			34.00%
Maximum | Expects | Oasis Midstream Partners, LP | Bobcat DevCo
Subsequent Event [Line Items]
Ownership interest (percent)			36.00%
Subsequent Event | 2019 Capital Expenditures Arrangement | Oasis
Subsequent Event [Line Items]
Amount under capital contributions agreement	$ 80.0