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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:        
Net income (loss) $ 66,223 $ (41,064) $ (246,366) $ (671)
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:        
Equity in earnings of subsidiaries 0 0 0 0
Depreciation, depletion and amortization 162,984 132,289 465,819 384,246
Loss on extinguishment of debt 47 0 13,698 0
Gain on sale of properties (36,869) 0 (38,823) 0
Impairment 0 139 384,228 6,021
Deferred income taxes     (75,418) (470)
Derivative instruments 48,544 54,310 239,945 (52,297)
Equity-based compensation expenses     21,586 20,451
Deferred financing costs amortization and other     20,074 12,666
Working capital and other changes:        
Change in accounts receivable     (61,275) (81,022)
Change in inventory     (12,076) (235)
Change in prepaid expenses     1,196 823
Change in other current assets     1 276
Change in long-term inventory and other assets     (490) (12,843)
Change in accounts payable, interest payable and accrued liabilities     50,308 32,282
Change in other current liabilities     0 (10,490)
Change in other liabilities     (406) 0
Net cash provided by operating activities     762,001 298,737
Cash flows from investing activities:        
Capital expenditures     (841,088) (443,649)
Acquisitions     (579,886) 0
Proceeds from sale of properties     333,029 4,000
Costs related to sale of properties     (2,707) 0
Derivative settlements     (162,013) (804)
Advances from joint interest partners     (1,038) (2,502)
Net cash used in investing activities     (1,253,703) (442,955)
Cash flows from financing activities:        
Proceeds from Revolving Credit Facilities     2,499,000 764,000
Principal payments on revolving credit facility     (1,959,000) (732,000)
Repurchase of senior unsecured notes     (423,190) 0
Proceeds from issuance of senior unsecured notes     400,000 0
Deferred financing costs     (7,650) (96)
Proceeds from issuance of Oasis Midstream common units, net of offering costs     0 115,813
Purchases of treasury stock     (6,806) (6,182)
Distributions to non-controlling interests     (10,393) 0
Investment in / capital contributions from subsidiaries     0 0
Other     (87) (55)
Net cash provided by financing activities     491,874 141,480
Increase (decrease) in cash and cash equivalents     172 (2,738)
Beginning of period     16,720 11,226
End of period 16,892 8,488 16,892 8,488
Intercompany Eliminations [Member]        
Cash flows from operating activities:        
Net income (loss) (137,241) 11,994 35,193 (75,984)
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:        
Equity in earnings of subsidiaries 135,390 (11,994) (41,446) 75,984
Depreciation, depletion and amortization (4,048) 0 (11,017) 0
Loss on extinguishment of debt 0   0  
Gain on sale of properties 0   0  
Impairment   0 0 0
Deferred income taxes     0 0
Derivative instruments 0 0 0 0
Equity-based compensation expenses     0 0
Deferred financing costs amortization and other     0 0
Working capital and other changes:        
Change in accounts receivable     234,798 (103,778)
Change in inventory     0 0
Change in prepaid expenses     0 0
Change in other current assets     0 0
Change in long-term inventory and other assets     0 0
Change in accounts payable, interest payable and accrued liabilities     (234,798) 103,778
Change in other current liabilities       0
Change in other liabilities     0  
Net cash provided by operating activities     (17,270) 0
Cash flows from investing activities:        
Capital expenditures     0 0
Acquisitions     0  
Proceeds from sale of properties     0 0
Costs related to sale of properties     0  
Derivative settlements     0 0
Advances from joint interest partners     0 0
Net cash used in investing activities     0 0
Cash flows from financing activities:        
Proceeds from Revolving Credit Facilities     0 0
Principal payments on revolving credit facility     0 0
Repurchase of senior unsecured notes     0  
Proceeds from issuance of senior unsecured notes     0  
Deferred financing costs     0 0
Proceeds from issuance of Oasis Midstream common units, net of offering costs       0
Purchases of treasury stock     0 0
Distributions to non-controlling interests     0  
Investment in / capital contributions from subsidiaries     17,270 0
Other     0 0
Net cash provided by financing activities     17,270 0
Increase (decrease) in cash and cash equivalents     0 0
Beginning of period     0 0
End of period 0 0 0 0
Parent/Issuer [Member]        
Cash flows from operating activities:        
Net income (loss) 62,341 (41,214) (257,273) (821)
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:        
Equity in earnings of subsidiaries (96,555) 13,599 149,295 (74,379)
Depreciation, depletion and amortization 0 0 0 0
Loss on extinguishment of debt 47   13,698  
Gain on sale of properties 0   0  
Impairment   0 0 0
Deferred income taxes     (26,351) (44,923)
Derivative instruments 0 0 0 0
Equity-based compensation expenses     20,292 19,740
Deferred financing costs amortization and other     11,955 11,399
Working capital and other changes:        
Change in accounts receivable     (227,589) 115,996
Change in inventory     0 0
Change in prepaid expenses     (350) (190)
Change in other current assets     0 0
Change in long-term inventory and other assets     0 0
Change in accounts payable, interest payable and accrued liabilities     (12,270) (12,571)
Change in other current liabilities       0
Change in other liabilities     0  
Net cash provided by operating activities     (328,593) 14,251
Cash flows from investing activities:        
Capital expenditures     0 0
Acquisitions     0  
Proceeds from sale of properties     0 0
Costs related to sale of properties     0  
Derivative settlements     0 0
Advances from joint interest partners     0 0
Net cash used in investing activities     0 0
Cash flows from financing activities:        
Proceeds from Revolving Credit Facilities     0 0
Principal payments on revolving credit facility     0 0
Repurchase of senior unsecured notes     (423,190)  
Proceeds from issuance of senior unsecured notes     400,000  
Deferred financing costs     (7,058) 0
Proceeds from issuance of Oasis Midstream common units, net of offering costs       0
Purchases of treasury stock     (6,806) (6,182)
Distributions to non-controlling interests     0  
Investment in / capital contributions from subsidiaries     365,601 (8,002)
Other     38 (55)
Net cash provided by financing activities     328,585 (14,239)
Increase (decrease) in cash and cash equivalents     (8) 12
Beginning of period     178 166
End of period 170 178 170 178
Combined Guarantor Subsidiaries [Member]        
Cash flows from operating activities:        
Net income (loss) 102,288 (13,449) (132,135) 74,529
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:        
Equity in earnings of subsidiaries (38,835) (1,605) (107,849) (1,605)
Depreciation, depletion and amortization 159,843 132,035 456,624 383,992
Loss on extinguishment of debt 0   0  
Gain on sale of properties (36,869)   (38,823)  
Impairment   139 384,228 6,021
Deferred income taxes     (49,067) 44,453
Derivative instruments 48,544 54,310 239,945 (52,297)
Equity-based compensation expenses     1,014 711
Deferred financing costs amortization and other     7,884 1,260
Working capital and other changes:        
Change in accounts receivable     (77,231) (87,610)
Change in inventory     (12,076) (235)
Change in prepaid expenses     864 1,013
Change in other current assets     1 276
Change in long-term inventory and other assets     (490) (12,843)
Change in accounts payable, interest payable and accrued liabilities     278,481 (62,542)
Change in other current liabilities       (10,490)
Change in other liabilities     (406)  
Net cash provided by operating activities     950,964 284,633
Cash flows from investing activities:        
Capital expenditures     (621,269) (443,649)
Acquisitions     (579,886)  
Proceeds from sale of properties     333,029 4,000
Costs related to sale of properties     (2,707)  
Derivative settlements     (162,013) (804)
Advances from joint interest partners     (1,038) (2,502)
Net cash used in investing activities     (1,033,884) (442,955)
Cash flows from financing activities:        
Proceeds from Revolving Credit Facilities     2,376,000 764,000
Principal payments on revolving credit facility     (1,924,000) (732,000)
Repurchase of senior unsecured notes     0  
Proceeds from issuance of senior unsecured notes     0  
Deferred financing costs     (261) 1,858
Proceeds from issuance of Oasis Midstream common units, net of offering costs       0
Purchases of treasury stock     0 0
Distributions to non-controlling interests     92,672  
Investment in / capital contributions from subsidiaries     (465,293) 121,714
Other     (125) 0
Net cash provided by financing activities     78,993 155,572
Increase (decrease) in cash and cash equivalents     (3,927) (2,750)
Beginning of period     15,659 11,060
End of period 11,732 8,310 11,732 8,310
Non-Guarantor Subsidiaries [Member]        
Cash flows from operating activities:        
Net income (loss) 38,835 1,605 107,849 1,605
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by (used in) operating activities:        
Equity in earnings of subsidiaries 0 0 0 0
Depreciation, depletion and amortization 7,189 254 20,212 254
Loss on extinguishment of debt 0   0  
Gain on sale of properties 0   0  
Impairment   0 0 0
Deferred income taxes     0 0
Derivative instruments 0 0 0 0
Equity-based compensation expenses     280 0
Deferred financing costs amortization and other     235 7
Working capital and other changes:        
Change in accounts receivable     8,747 (5,630)
Change in inventory     0 0
Change in prepaid expenses     682 0
Change in other current assets     0 0
Change in long-term inventory and other assets     0 0
Change in accounts payable, interest payable and accrued liabilities     18,895 3,617
Change in other current liabilities       0
Change in other liabilities     0  
Net cash provided by operating activities     156,900 (147)
Cash flows from investing activities:        
Capital expenditures     (219,819) 0
Acquisitions     0  
Proceeds from sale of properties     0 0
Costs related to sale of properties     0  
Derivative settlements     0 0
Advances from joint interest partners     0 0
Net cash used in investing activities     (219,819) 0
Cash flows from financing activities:        
Proceeds from Revolving Credit Facilities     123,000 0
Principal payments on revolving credit facility     (35,000) 0
Repurchase of senior unsecured notes     0  
Proceeds from issuance of senior unsecured notes     0  
Deferred financing costs     (331) (1,954)
Proceeds from issuance of Oasis Midstream common units, net of offering costs       115,813
Purchases of treasury stock     0 0
Distributions to non-controlling interests     (103,065)  
Investment in / capital contributions from subsidiaries     82,422 (113,712)
Other     0 0
Net cash provided by financing activities     67,026 147
Increase (decrease) in cash and cash equivalents     4,107 0
Beginning of period     883 0
End of period $ 4,990 $ 0 $ 4,990 $ 0