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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) | Sep. 30, 2021 | Jun. 09, 2021 | Mar. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total long-term debt, net | $ 1,041,895,000 |  |  | $ 710,000,000
Credit Facility | OMP Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt, net | 210,000,000 |  |  |
Senior Notes | Oasis Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 400,000,000 |  |
Less: unamortized deferred financing costs on Senior Notes |  | $ (9,000,000) |  |
Senior Notes | OMP Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  |  | $ 450,000,000 |
Less: unamortized deferred financing costs on Senior Notes |  |  | $ (10,200,000) |
Oasis Guarantors |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt, net | 391,505,000 |  |  | 260,000,000
Oasis Guarantors | Credit Facility | Oasis Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | 0 |  |  | 260,000,000
Oasis Guarantors | Senior Notes | Oasis Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | 400,000,000 |  |  | 0
Less: unamortized deferred financing costs on Senior Notes | (8,495,000) |  |  | 0
Oasis Midstream Partners, LP |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt, net | 650,390,000 |  |  | 450,000,000
Oasis Midstream Partners, LP | Credit Facility | OMP Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | 210,000,000 |  |  | 450,000,000
Oasis Midstream Partners, LP | Senior Notes | OMP Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross | 450,000,000 |  |  | 0
Less: unamortized deferred financing costs on Senior Notes | $ (9,610,000) |  |  | $ 0

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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