| Document and Entity Information | Dec. 18, 2024 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0000727538 |
| Document Type | 8-K |
| Document Period End Date | Dec. 18, 2024 |
| Entity Registrant Name | OFFSHORE PETROLEUM INVESTMENT PARTNERSHIP |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 0-13546 |
| Entity Tax Identification Number | 41-1464066 |
| Entity Address, Address Line One | 2000 W. Sam Houston Pkwy. S. |
| Entity Address, Address Line Two | Suite 200 |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77042-3643 |
| City Area Code | (713) |
| Local Phone Number | 296-6000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
