Earnings (Loss) Per Limited Partner Unit (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019		Jun. 30, 2020	Jun. 30, 2019
Net income attributable to Oasis Midstream Partners LP
Distribution declared	$ 19,285	$ 17,051		$ 38,570	$ 33,173
Undistributed loss attributable to Oasis Midstream Partners LP	(7,411)	9,147		(98,095)	14,568
Net income (loss) attributable to Oasis Midstream Partners LP	11,874	26,198		(59,525)	47,741
General Partner
Net income attributable to Oasis Midstream Partners LP
Distribution declared	1,027	491		2,054	729
Undistributed loss attributable to Oasis Midstream Partners LP	0	0		0	0
Net income (loss) attributable to Oasis Midstream Partners LP	$ 1,027	$ 491		$ 2,054	$ 729
Common Units
Weighted average units outstanding:
Basic weighted average common units outstanding (shares)	20,045	20,024	[1]	20,043	20,020	[1]
Diluted weighted average common units outstanding (in shares)	20,045	20,034	[1]	20,043	20,037	[1]
Common Units | Limited Partner
Weighted average units outstanding:
Basic weighted average common units outstanding (shares)	20,045	20,024		20,043	20,020
Dilutive effect of restricted awards (shares)	0	10		0	17
Diluted weighted average common units outstanding (in shares)	20,045	20,034		20,043	20,037
Net income attributable to Oasis Midstream Partners LP
Distribution declared	$ 10,833	$ 9,822		$ 21,666	$ 19,243
Undistributed loss attributable to Oasis Midstream Partners LP	(4,396)	5,423		(58,182)	8,637
Net income (loss) attributable to Oasis Midstream Partners LP	$ 6,437	$ 15,245		$ (36,516)	$ 27,880
Net income attributable to Oasis Midstream Partners LP per limited partner unit
Common units - Basic (in usd per share)	$ 0.32	$ 0.76		$ (1.82)	$ 1.39
Common units - Diluted (in usd per share)	$ 0.32			$ (1.82)	$ 1.39
Anti-dilutive restricted units (shares)	16	11		9	7
Subordinated Units | Limited Partner
Net income attributable to Oasis Midstream Partners LP
Distribution declared	$ 7,425	$ 6,738		$ 14,850	$ 13,201
Undistributed loss attributable to Oasis Midstream Partners LP	(3,015)	3,724		(39,913)	5,931
Net income (loss) attributable to Oasis Midstream Partners LP	$ 4,410	$ 10,462		$ (25,063)	$ 19,132

[1] Retrospectively adjusted for the transfer of net assets between entities under common control. See Note 2 to our unaudited condensed consolidated financial statements.