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Acquisitions - Pro Forma (Details) - Permian Basin Acquisition - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition, Pro Forma Information [Abstract] |  |
Revenues | $ 2,327,476 | $ 1,337,468
Net income | $ (30,754) | $ 159,838
Net income (loss) attributable to Oasis per share - basic (in usd per share) | $ (0.10) | $ 0.57
Net income (loss) attributable to Oasis per share - diluted (in usd per share) | $ (0.10) | $ 0.56

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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