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Condensed Consolidating Financial Statements - Schedule of Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Nov. 13, 2017
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
Cash flows from operating activities:                        
Net income (loss)   $ 226,866 $ 66,223 $ (316,301) $ 3,712 $ 128,117 $ (41,064) $ 16,568 $ 23,825 $ (19,500) $ 127,446 $ (243,016)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                        
Equity in loss of subsidiaries                   0 0 0
Depreciation, depletion and amortization                   636,296 530,802 476,331
(Gain) loss on extinguishment of debt                   13,848 0 (4,741)
Loss on sale of properties                   (28,587) (1,774) 1,303
Impairment                   384,228 6,887 4,684
Deferred income taxes                   (5,866) (202,884) (128,538)
Derivative instruments                   (28,457) 71,657 105,317
Equity-based compensation expenses                   29,273 26,534 24,103
Deferred financing costs amortization and other                   29,057 18,311 14,334
Working capital and other changes:                        
Change in accounts receivable, net                   (23,508) (166,386) (11,923)
Change in inventory                   (14,346) (2,501) 254
Change in prepaid expenses                   (2,354) (838) (295)
Change in other current assets                   10 148 (305)
Change in long-term inventory and other assets                   (144) (12,143) (151)
Change in accounts payable, interest payable and accrued liabilities                   26,116 123,107 (13,839)
Change in other current liabilities                   (40) (10,450) 4,490
Change in other liabilities                   395 (40) 10
Net cash provided by operating activities                   996,421 507,876 228,018
Cash flows from investing activities:                        
Capital expenditures                   (1,148,961) (647,349) (426,256)
Acquisitions                   (581,650) (61,874) (781,522)
Acquisitions of oil and gas properties                     (61,874) (781,522)
Proceeds from sale of properties                   333,229 5,774 12,333
Costs related to sale of properties                   (2,850) (366) (310)
Derivative settlements                   (213,528) (8,264)  
Advances from joint interest partners                     (2,681)  
Derivative settlements                       121,977
Advances from joint interest partners                   224   2,950
Net cash used in investing activities                   (1,613,536) (714,760) (1,070,828)
Cash flows from financing activities:                        
Proceeds from Revolving Credit Facilities                   3,224,000 1,162,000 1,407,000
Principal payments on revolving credit facility                   (2,586,000) (1,377,000) (1,182,000)
Repurchase of senior unsecured notes                   (423,340) 0 (435,907)
Proceeds from issuance of senior unsecured notes                   400,000 0 300,000
Deferred financing costs                   (13,862) (2,714) (9,127)
Proceeds from sale of common stock $ 302,600                 0 302,191 766,670
Proceeds from sale of Oasis Midstream common units, net of offering costs                   44,503 134,185 0
Purchases of treasury stock                   (6,846) (6,229) (2,330)
Distributions to non-controlling interests                   (14,114) 0 0
Investment in / capital contributions from subsidiaries                   0 0 0
Other                   (1,756) (55) 0
Net cash provided by financing activities                   622,585 212,378 844,306
Increase in cash and cash equivalents                   5,470 5,494 1,496
Beginning of period         16,720       11,226 16,720 11,226 9,730
End of period   22,190       16,720       22,190 16,720 11,226
Intercompany Eliminations                        
Cash flows from operating activities:                        
Net income (loss)                   (259,130) (360,887) 140,978
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                        
Equity in loss of subsidiaries                   249,995 358,921 (140,978)
Depreciation, depletion and amortization                   (15,462) (2,439) 0
(Gain) loss on extinguishment of debt                   0   0
Loss on sale of properties                   0 0 0
Impairment                   0 0 0
Deferred income taxes                   0 0 0
Derivative instruments                   0 0 0
Equity-based compensation expenses                   0 0 0
Deferred financing costs amortization and other                   0 0 0
Working capital and other changes:                        
Change in accounts receivable, net                   242,808 277,887 30,883
Change in inventory                   0 0 0
Change in prepaid expenses                   0 0 0
Change in other current assets                   0 0 0
Change in long-term inventory and other assets                   0 0 0
Change in accounts payable, interest payable and accrued liabilities                   (242,808) (277,887) (30,883)
Change in other current liabilities                   0 0 0
Change in other liabilities                   0 0 0
Net cash provided by operating activities                   (24,597) (4,405) 0
Cash flows from investing activities:                        
Capital expenditures                   0 0 0
Acquisitions                   0    
Acquisitions of oil and gas properties                     66,679 0
Proceeds from sale of properties                   0 (66,679) 0
Costs related to sale of properties                   0 0 0
Derivative settlements                   0 0  
Advances from joint interest partners                     0  
Derivative settlements                       0
Advances from joint interest partners                   0   0
Net cash used in investing activities                   0 0 0
Cash flows from financing activities:                        
Proceeds from Revolving Credit Facilities                   0 0 0
Principal payments on revolving credit facility                   0 0 0
Repurchase of senior unsecured notes                   0   0
Proceeds from issuance of senior unsecured notes                   0   0
Deferred financing costs                   0 0 0
Proceeds from sale of common stock                     0 0
Proceeds from sale of Oasis Midstream common units, net of offering costs                   0 0  
Purchases of treasury stock                   0 0 0
Distributions to non-controlling interests                   0    
Investment in / capital contributions from subsidiaries                   24,597 4,405 0
Other                   0 0  
Net cash provided by financing activities                   24,597 4,405 0
Increase in cash and cash equivalents                   0 0 0
Beginning of period         0       0 0 0 0
End of period   0       0       0 0 0
Parent/ Issuer                        
Cash flows from operating activities:                        
Net income (loss)                   (35,296) 123,796 (243,016)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                        
Equity in loss of subsidiaries                   (103,586) (323,953) 140,978
Depreciation, depletion and amortization                   0 0 0
(Gain) loss on extinguishment of debt                   13,848   (4,741)
Loss on sale of properties                   0 0 0
Impairment                   0 0 0
Deferred income taxes                   (36,102) 41,213 (48,796)
Derivative instruments                   0 0 0
Equity-based compensation expenses                   27,456 25,436 23,346
Deferred financing costs amortization and other                   16,069 15,392 9,107
Working capital and other changes:                        
Change in accounts receivable, net                   (217,714) (173,668) (250,737)
Change in inventory                   0 0 0
Change in prepaid expenses                   (106) 9 3
Change in other current assets                   0 0 0
Change in long-term inventory and other assets                   0 0 100
Change in accounts payable, interest payable and accrued liabilities                   6,886 7,074 (230,518)
Change in other current liabilities                   0 0 0
Change in other liabilities                   0 0 0
Net cash provided by operating activities                   (328,545) (284,701) (604,274)
Cash flows from investing activities:                        
Capital expenditures                   0 0 0
Acquisitions                   0    
Acquisitions of oil and gas properties                     0 0
Proceeds from sale of properties                   0 0 0
Costs related to sale of properties                   0 0 0
Derivative settlements                   0 0  
Advances from joint interest partners                     0  
Derivative settlements                       0
Advances from joint interest partners                   0   0
Net cash used in investing activities                   0 0 0
Cash flows from financing activities:                        
Proceeds from Revolving Credit Facilities                   0 0 0
Principal payments on revolving credit facility                   0 0 0
Repurchase of senior unsecured notes                   (423,340)   (435,907)
Proceeds from issuance of senior unsecured notes                   400,000   300,000
Deferred financing costs                   (6,908) 0 (8,197)
Proceeds from sale of common stock                     302,191 766,670
Proceeds from sale of Oasis Midstream common units, net of offering costs                   0 0  
Purchases of treasury stock                   (6,846) (6,229) (2,330)
Distributions to non-controlling interests                   0    
Investment in / capital contributions from subsidiaries                   365,602 (11,194) (16,573)
Other                   38 (55)  
Net cash provided by financing activities                   328,546 284,713 603,663
Increase in cash and cash equivalents                   1 12 (611)
Beginning of period         178       166 178 166 777
End of period   179       178       179 178 166
Combined Guarantor Subsidiaries                        
Cash flows from operating activities:                        
Net income (loss)                   128,517 329,569 (140,978)
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                        
Equity in loss of subsidiaries                   (146,409) (34,968) 0
Depreciation, depletion and amortization                   623,354 528,615 476,331
(Gain) loss on extinguishment of debt                   0   0
Loss on sale of properties                   (28,587) (1,774) 1,303
Impairment                   384,228 6,887 4,684
Deferred income taxes                   30,236 (244,097) (79,742)
Derivative instruments                   (28,457) 71,657 105,317
Equity-based compensation expenses                   1,461 1,045 757
Deferred financing costs amortization and other                   13,507 2,794 5,227
Working capital and other changes:                        
Change in accounts receivable, net                   (52,013) (216,982) 207,931
Change in inventory                   (14,324) (2,501) 254
Change in prepaid expenses                   (1,608) (98) (298)
Change in other current assets                   10 148 (305)
Change in long-term inventory and other assets                   (144) (12,143) (251)
Change in accounts payable, interest payable and accrued liabilities                   234,425 337,319 247,562
Change in other current liabilities                   (40) (10,450) 4,490
Change in other liabilities                   395 (40) 10
Net cash provided by operating activities                   1,144,551 754,981 832,292
Cash flows from investing activities:                        
Capital expenditures                   (872,151) (594,945) (426,256)
Acquisitions                   (581,650)    
Acquisitions of oil and gas properties                     (61,874) (781,522)
Proceeds from sale of properties                   333,229 72,453 12,333
Costs related to sale of properties                   (2,850) (366) (310)
Derivative settlements                   (213,528) (8,264)  
Advances from joint interest partners                     (2,681)  
Derivative settlements                       121,977
Advances from joint interest partners                   224   2,950
Net cash used in investing activities                   (1,336,726) (595,677) (1,070,828)
Cash flows from financing activities:                        
Proceeds from Revolving Credit Facilities                   2,949,000 1,084,000 1,407,000
Principal payments on revolving credit facility                   (2,551,000) (1,377,000) (1,182,000)
Repurchase of senior unsecured notes                   0   0
Proceeds from issuance of senior unsecured notes                   0   0
Deferred financing costs                   (5,988) (577) (930)
Proceeds from sale of common stock                     0 0
Proceeds from sale of Oasis Midstream common units, net of offering costs                   0 0  
Purchases of treasury stock                   0 0 0
Distributions to non-controlling interests                   114,789    
Investment in / capital contributions from subsidiaries                   (313,129) 138,872 16,573
Other                   (1,794) 0  
Net cash provided by financing activities                   191,878 (154,705) 240,643
Increase in cash and cash equivalents                   (297) 4,599 2,107
Beginning of period         15,659       11,060 15,659 11,060 8,953
End of period   15,362       15,659       15,362 15,659 11,060
Combined Non-guarantor Subsidiaries                        
Cash flows from operating activities:                        
Net income (loss)                   146,409 34,968  
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                        
Equity in loss of subsidiaries                   0 0  
Depreciation, depletion and amortization                   28,404 4,626  
(Gain) loss on extinguishment of debt                   0    
Loss on sale of properties                   0 0  
Impairment                   0 0  
Deferred income taxes                   0 0  
Derivative instruments                   0 0  
Equity-based compensation expenses                   356 53  
Deferred financing costs amortization and other                   (519) 125  
Working capital and other changes:                        
Change in accounts receivable, net                   3,411 (53,623)  
Change in inventory                   (22) 0  
Change in prepaid expenses                   (640) (749)  
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                   27,613 56,601  
Change in other current liabilities                   0 0  
Change in other liabilities                   0 0  
Net cash provided by operating activities                   205,012 42,001  
Cash flows from investing activities:                        
Capital expenditures                   (276,810) (52,404)  
Acquisitions                   0    
Acquisitions of oil and gas properties                     (66,679)  
Proceeds from sale of properties                   0 0  
Costs related to sale of properties                   0 0  
Derivative settlements                   0 0  
Advances from joint interest partners                     0  
Advances from joint interest partners                   0    
Net cash used in investing activities                   (276,810) (119,083)  
Cash flows from financing activities:                        
Proceeds from Revolving Credit Facilities                   275,000 78,000  
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                   (966) (2,137)  
Proceeds from sale of common stock                     0  
Proceeds from sale of Oasis Midstream common units, net of offering costs                   44,503 134,185  
Purchases of treasury stock                   0 0  
Distributions to non-controlling interests                   (128,903)    
Investment in / capital contributions from subsidiaries                   (77,070) (132,083)  
Other                   0 0  
Net cash provided by financing activities                   77,564 77,965  
Increase in cash and cash equivalents                   5,766 883  
Beginning of period         $ 883       $ 0 883 0  
End of period   $ 6,649       $ 883       $ 6,649 $ 883 $ 0