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Summary of Significant Accounting Policies - Impacts of Revisions to the Company’s Condensed Consolidated Statement of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues $ 482,743 $ 674,629 $ 1,587,880 $ 1,722,192
Total operating expenses 473,550 532,453 1,453,473 1,711,659
Net income (loss) attributable to Oasis $ 20,288 $ 62,341 $ (51,837) $ (257,273)
Basic (in dollars per share)   $ 0.20 $ (0.16) $ (0.84)
Diluted (in dollars per share)   $ 0.20 $ (0.16) $ (0.84)
As Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   $ 546,448   $ 1,469,001
Total operating expenses   404,272   1,458,468
Net income (loss) attributable to Oasis   $ 62,341   $ (257,273)
Basic (in dollars per share) $ 0.06 $ 0.20   $ (0.84)
Diluted (in dollars per share) $ 0.06 $ 0.20   $ (0.84)
Revision        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   $ 128,181   $ 253,191
Total operating expenses   128,181   253,191
Net income (loss) attributable to Oasis   $ 0   $ 0
Basic (in dollars per share)   $ 0   $ 0
Diluted (in dollars per share)   $ 0   $ 0
Oil and gas revenues        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues $ 344,470 $ 454,195 $ 1,070,256 $ 1,218,639
Oil and gas revenues | As Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   452,643   1,212,235
Oil and gas revenues | Revision        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   1,552   6,404
Purchased oil and gas        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues 79,352 172,985 337,212 368,758
Purchased oil and gas expenses $ 78,655 174,269 $ 338,221 374,442
Purchased oil and gas | As Reported        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   46,356   121,971
Purchased oil and gas expenses   46,088   121,251
Purchased oil and gas | Revision        
Error Corrections and Prior Period Adjustments Restatement [Line Items]        
Total revenues   126,629   246,787
Purchased oil and gas expenses   $ 128,181   $ 253,191