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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
Mar. 31, 2019
Mar. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Total revenues $ 575,732 $ 473,812
Total operating expenses 522,366 360,827
Net income attributable to Oasis $ (114,882) $ 590
Basic (in dollars per share) $ (0.37) $ 0.00
Diluted (in dollars per share) $ (0.37) $ 0.00
As Reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Total revenues   $ 421,216
Total operating expenses   308,231
Net income attributable to Oasis   $ 590
Basic (in dollars per share)   $ 0.00
Diluted (in dollars per share)   $ 0.00
Revision    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Total revenues   $ 52,596
Total operating expenses   52,596
Net income attributable to Oasis   $ 0
Basic (in dollars per share)   $ 0.00
Diluted (in dollars per share)   $ 0.00
Oil and gas revenues    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Total revenues $ 368,782 $ 366,595
Oil and gas revenues | As Reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Total revenues   363,671
Oil and gas revenues | Revision    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Total revenues   2,924
Purchased oil and gas    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Total revenues 148,471 67,709
Purchased oil and gas expenses $ 149,904 70,594
Purchased oil and gas | As Reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Total revenues   18,037
Purchased oil and gas expenses   17,998
Purchased oil and gas | Revision    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Total revenues   49,672
Purchased oil and gas expenses   $ 52,596