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Quarterly Financial Data - Unaudited - Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Total revenues $ 599,755 $ 674,629 $ 573,751 $ 473,812 $ 434,875 $ 320,283 $ 260,809 $ 277,752 $ 2,321,947 $ 1,293,719 $ 704,665
Total expenses   532,453 818,379 360,827 350,546 287,889 255,430 257,660 2,231,522 1,151,525 834,195
Operating income (loss) 69,656 179,045 (242,674) 112,985 86,103 32,394 5,379 20,092 119,012 143,968 (130,833)
Net income (loss) including non-controlling interests 226,866 66,223 (316,301) 3,712 128,117 (41,064) 16,568 23,825 (19,500) 127,446 (243,016)
Net income (loss) attributable to Oasis $ 221,977 $ 62,341 $ (320,204) $ 590 $ 124,617 $ (41,214) $ 16,568 $ 23,825 $ (35,296) $ 123,796 $ (243,016)
Basic earnings (loss) per share (in dollars per share) $ 0.71 $ 0.20 $ (1.02) $ 0.00 $ 0.52 $ (0.18) $ 0.07 $ 0.10 $ (0.11) $ 0.53 $ (1.32)
Diluted earnings (loss) per share (in dollars per share) $ 0.70 $ 0.20 $ (1.02) $ 0.00 $ 0.52 $ (0.18) $ 0.07 $ 0.10 $ (0.11) $ 0.52 $ (1.32)
As Reported                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Total revenues   $ 546,448 $ 501,337 $ 421,216 $ 404,469 $ 304,748 $ 254,091 $ 285,116   $ 1,248,424  
Total expenses   404,272 745,965 308,231 320,140 272,354 248,712 265,024   1,106,230  
Operating income (loss)   179,045 (242,674) 112,985 86,103 32,394 5,379 20,092      
Net income (loss) including non-controlling interests   66,223 (316,301) 3,712 128,117 (41,064) 16,568 23,825      
Net income (loss) attributable to Oasis   $ 62,341 $ (320,204) $ 590 $ 124,617 $ (41,214) $ 16,568 $ 23,825   $ 123,796  
Basic earnings (loss) per share (in dollars per share)   $ 0.20 $ (1.02) $ 0.00 $ 0.52 $ (0.18) $ 0.07 $ 0.10   $ 0.53  
Diluted earnings (loss) per share (in dollars per share)   $ 0.20 $ (1.02) $ 0.00 $ 0.52 $ (0.18) $ 0.07 $ 0.10   $ 0.52  
Revision                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Total revenues   $ 128,181 $ 72,414 $ 52,596 $ 30,406 $ 15,535 $ 6,718 $ (7,364)   $ 45,295  
Total expenses   128,181 72,414 52,596 30,406 15,535 6,718 (7,364)   45,295  
Operating income (loss)   0 0 0 0 0 0 0      
Net income (loss) including non-controlling interests   0 0 0 0 0 0 0      
Net income (loss) attributable to Oasis   $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0   $ 0  
Basic earnings (loss) per share (in dollars per share)   $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00   $ 0.00  
Diluted earnings (loss) per share (in dollars per share)   $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00   $ 0.00  
Oil and gas                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Total revenues   $ 454,195 $ 397,849 $ 366,595 $ 330,290 $ 248,576 $ 218,523 $ 237,245 $ 1,590,024 $ 1,034,634 $ 625,233
Oil and gas | As Reported                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Total revenues   452,643 395,921 363,671 330,359 248,648 218,633 237,252   1,034,892  
Oil and gas | Revision                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Total revenues   1,552 1,928 2,924 (69) (72) (110) (7)   (258)  
Purchased oil and gas                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Total revenues   172,985 128,064 67,709 61,547 36,802 14,919 20,274 551,808 133,542 10,272
Operating expenses   174,269 129,579 70,594 62,043 37,236 14,698 20,638 $ 554,307 134,615 $ 10,258
Purchased oil and gas | As Reported                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Total revenues   46,356 57,578 18,037 31,072 21,195 8,091 27,631   87,989  
Operating expenses   46,088 57,165 17,998 31,637 21,701 7,980 28,002   89,320  
Purchased oil and gas | Revision                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Total revenues   126,629 70,486 49,672 30,475 15,607 6,828 (7,357)   45,553  
Operating expenses   $ 128,181 $ 72,414 $ 52,596 $ 30,406 $ 15,535 $ 6,718 $ (7,364)   $ 45,295