Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 26, 2021, the Company announced that on October 25, 2021, OMP and OMP GP entered into an Agreement and Plan of Merger (the “Merger Agreement”), with Crestwood Equity Partners LP, a Delaware limited partnership (“Crestwood”), Project Falcon Merger Sub LLC, a Delaware limited liability company and direct wholly-owned subsidiary of Crestwood (“Merger Sub”), Project Phantom Merger Sub LLC, a Delaware limited liability company and direct wholly-owned subsidiary of Crestwood (“GP Merger Sub”), and, solely for the purposes of Section 2.1(a)(i) of the Merger Agreement, Crestwood Equity GP LLC, a Delaware limited liability company and the general partner of Crestwood (“Crestwood GP”). Upon the terms and subject to the conditions set forth in the Merger Agreement, Merger Sub will merge with and into OMP (the “LP Merger”), with OMP surviving the LP Merger as a subsidiary of Crestwood, and GP Merger Sub will merge with and into OMP GP (the “GP Merger” and, together with the LP Merger, the “Mergers”), with OMP GP surviving the GP Merger as a wholly-owned subsidiary of Crestwood. Under the terms of the Merger Agreement, Oasis, as a unitholder of OMP, will receive $160.0 million in cash in addition to approximately 21.0 million common units of Crestwood in aggregate in exchange for its ownership of OMP common units and non-economic general partner stake in OMP GP. At the effective time of the Mergers (the “Effective Time”): (i) 6,520,944 common units representing limited partner interests in OMP (“OMP Common Units”) issued and outstanding immediately prior to the Effective Time and owned by OMS Holdings (such OMP Common Units, the “Sponsor Cash Units”), will be converted into and will thereafter represent the right to receive $150.0 million in cash in the aggregate and each other OMP Common Unit issued and outstanding immediately prior to the Effective Time owned by the Company or its subsidiaries (other than OMP) (together with the Sponsor Cash Units, the “Sponsor Units”) will be converted into and will thereafter represent the right to receive 0.7680 common units representing limited partner interests in Crestwood (“Crestwood Common Units”); (ii) each OMP Common Unit issued and outstanding immediately prior to the Effective Time (other than the Sponsor Units) will be converted into and will thereafter represent the right to receive 0.8700 (the “Public Holder Exchange Ratio”) Crestwood Common Units and (iii) all of the limited liability company interests of OMP GP issued and outstanding as of immediately prior to the Effective Time will be converted into and will thereafter represent the right to receive $10.0 million in cash. Upon completion of the Mergers, the Company is expected to own approximately 22% of the Crestwood Common Units. The Mergers were unanimously approved by the Board of Directors of both Oasis and Crestwood and have also been unanimously approved by the Board of Directors and Conflicts Committee of OMP GP. The Mergers are expected to close in the first quarter of 2022 and are subject to customary closing conditions. Contemporaneously with the execution of the Merger Agreement, the Company, OMP, Crestwood, OMP GP and OMS Holdings entered into a support agreement (the “Support Agreement”) regarding the OMP Common Units owned by the Company and OMS Holdings (or their affiliates). Pursuant to the Support Agreement, the Company and OMS Holdings have agreed to, among other things (and as applicable), following effectiveness of a registration statement of Crestwood on Form S-4 in connection with the issuance of Crestwood Common Units in the LP Merger, execute and deliver, or cause an affiliate to execute and deliver, a written consent covering all of their OMP Units, approving the Merger Agreement and the transactions contemplated thereby. The Support Agreement and the Merger Agreement may be terminated in the event the written consent is not delivered.