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Oasis Midstream Partners LP (Details) $ / shares in Units, MMcf / d in Millions, $ in Millions				9 Months Ended	12 Months Ended
	Nov. 06, 2017 MMcf / d	Sep. 25, 2017 USD ($) $ / shares shares	May 22, 2017	Sep. 30, 2017	Dec. 31, 2017 USD ($)
Affiliated Entity [Member] | Commercial Agreements with OPNA, Oasis Petroleum Marketing LLC (“OPM”) and OMS [Member]
Related Party Transaction [Line Items]
Contract term, maximum				15 years
Common Units [Member]
Related Party Transaction [Line Items]
Shares issued, price per share (in usd per share) | $ / shares		$ 17.00
Oasis Midstream Partners, LP [Member] | Common Units [Member] | Partnership Interest [Member]
Related Party Transaction [Line Items]
Common units sold in IPO (shares)		7,500,000
Shares issued, price per share, net of underwriting discounts and commissions (in usd per share) | $ / shares		$ 15.98
Proceeds from issuance of shares in IPO | $		$ 134.2
Net proceeds distributed to Oasis | $		$ 132.1
Oasis Midstream Partners, LP [Member]
Related Party Transaction [Line Items]
Limited partner interest in OMP (percent)		68.60%
Oasis Midstream Partners, LP [Member] | Common Units [Member]
Related Party Transaction [Line Items]
Common units sold in IPO (shares)		5,125,000
Oasis Midstream Partners, LP [Member] | Subordinated Units [Member]
Related Party Transaction [Line Items]
Common units sold in IPO (shares)		13,750,000
Underwriters' option | Oasis Midstream Partners, LP [Member] | Common Units [Member] | Partnership Interest [Member]
Related Party Transaction [Line Items]
Common units sold in IPO (shares)		1,125,000
Restricted unit awards | OMP [Member]
Related Party Transaction [Line Items]
Vesting period			10 years
Percentage of outstanding units (percent)			10.00%
Gas Gathering, Compression, Processing and Gas Lift Agreement [Member] | Affiliated Entity [Member] | Contract for Construction of Natural Gas Processing Plant [Member]
Related Party Transaction [Line Items]
Processing plant capacity (in cubic ft per day) | MMcf / d	200
Gas Gathering, Compression, Processing and Gas Lift Agreement [Member] | Affiliated Entity [Member] | Estimated Reimbursements, Plant II [Member]
Related Party Transaction [Line Items]
Estimate of reimbursable amounts from OMP | $					$ 66.7

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