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Condensed Consolidating Financial Statements - Schedule of Condensed Consolidating Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets, Current [Abstract]        
Cash and cash equivalents $ 20,019 $ 22,190    
Accounts receivable, net 371,181 387,602    
Accounts receivable - affiliates 0 0    
Inventory 35,259 33,128    
Prepaid expenses 10,011 10,997    
Derivative instruments 535 99,930    
Intangible assets, net   125    
Other current assets 346 183    
Total current assets 437,351 554,155    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 9,463,038 8,912,189    
Other property and equipment 1,279,653 1,151,772    
Less: accumulated depreciation, depletion, amortization and impairment (3,764,915) (3,036,852)    
Total property, plant and equipment, net 6,977,776 7,027,109 $ 6,173,486  
Assets held for sale, net 21,628 0    
Investments in and advances to subsidiaries 0 0    
Derivative instruments 639 6,945    
Deferred income taxes 0 0    
Long-term inventory 13,924 12,260    
Operating right-of-use assets 18,497      
Other assets 29,438 25,673    
Total assets 7,499,253 7,626,142 6,622,929  
Current liabilities        
Accounts payable 17,948 20,166    
Accounts payable - affiliates 0 0    
Revenues and production taxes payable 233,090 216,695    
Accrued liabilities 281,079 331,651    
Accrued interest payable 37,388 38,040    
Derivative instruments 19,695 84    
Advances from joint interest partners 4,598 5,140    
Current operating lease liabilities 6,182      
Other current liabilities 2,903 0    
Total current liabilities 602,883 611,776    
Long-term debt 2,711,573 2,735,276    
Deferred income taxes 267,357 300,055    
Asset retirement obligations 56,305 52,384    
Derivative instruments 120 20    
Operating lease liabilities 17,915      
Other liabilities 6,019 7,751    
Total liabilities 3,662,172 3,707,262    
Stockholders’ equity        
Oasis share of stockholders’ equity 3,636,138 3,734,576    
Non-controlling interests 200,943 184,304    
Total stockholders’ equity 3,837,081 3,918,880 $ 3,513,579 $ 2,923,157
Total liabilities and stockholders’ equity 7,499,253 7,626,142    
Intercompany Eliminations        
Assets, Current [Abstract]        
Cash and cash equivalents 0 0    
Accounts receivable, net 0 0    
Accounts receivable - affiliates (652,959) (800,531)    
Inventory 0 0    
Prepaid expenses 0 0    
Derivative instruments 0 0    
Intangible assets, net   0    
Other current assets 0 0    
Total current assets (652,959) (800,531)    
Property, plant and equipment        
Oil and gas properties (successful efforts method) (22,466) (11,102)    
Other property and equipment 0 0    
Less: accumulated depreciation, depletion, amortization and impairment 0 0    
Total property, plant and equipment, net (22,466) (11,102)    
Assets held for sale, net 0      
Investments in and advances to subsidiaries (5,271,052) (5,262,794)    
Derivative instruments 0 0    
Deferred income taxes (249,646) (219,670)    
Long-term inventory 0 0    
Operating right-of-use assets 0      
Other assets 0 0    
Total assets (6,196,123) (6,294,097)    
Current liabilities        
Accounts payable 0 0    
Accounts payable - affiliates (652,959) (800,531)    
Revenues and production taxes payable 0 0    
Accrued liabilities 0 0    
Accrued interest payable 0 0    
Derivative instruments 0 0    
Advances from joint interest partners 0 0    
Current operating lease liabilities 0      
Other current liabilities (121)      
Total current liabilities (653,080) (800,531)    
Long-term debt 0 0    
Deferred income taxes (249,646) (219,670)    
Asset retirement obligations 0 0    
Derivative instruments 0 0    
Operating lease liabilities 0      
Other liabilities (1,455) 0    
Total liabilities (904,181) (1,020,201)    
Stockholders’ equity        
Oasis share of stockholders’ equity (5,180,627) (5,145,385)    
Non-controlling interests (111,315) (128,511)    
Total stockholders’ equity (5,291,942) (5,273,896)    
Total liabilities and stockholders’ equity (6,196,123) (6,294,097)    
Parent/ Issuer        
Assets, Current [Abstract]        
Cash and cash equivalents 146 179    
Accounts receivable, net 0 0    
Accounts receivable - affiliates 499,209 643,382    
Inventory 0 0    
Prepaid expenses 550 373    
Derivative instruments 0 0    
Intangible assets, net   0    
Other current assets 0 0    
Total current assets 499,905 643,934    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 0 0    
Other property and equipment 0 0    
Less: accumulated depreciation, depletion, amortization and impairment 0 0    
Total property, plant and equipment, net 0 0    
Assets held for sale, net 0      
Investments in and advances to subsidiaries 4,888,257 4,900,528    
Derivative instruments 0 0    
Deferred income taxes 249,646 219,670    
Long-term inventory 0 0    
Operating right-of-use assets 0      
Other assets 0 0    
Total assets 5,637,808 5,764,132    
Current liabilities        
Accounts payable 0 0    
Accounts payable - affiliates 49,040 43,113    
Revenues and production taxes payable 0 0    
Accrued liabilities 50 71    
Accrued interest payable 36,507 37,096    
Derivative instruments 0 0    
Advances from joint interest partners 0 0    
Current operating lease liabilities 0      
Other current liabilities 0      
Total current liabilities 85,597 80,280    
Long-term debt 1,916,073 1,949,276    
Deferred income taxes 0 0    
Asset retirement obligations 0 0    
Derivative instruments 0 0    
Operating lease liabilities 0      
Other liabilities 0 0    
Total liabilities 2,001,670 2,029,556    
Stockholders’ equity        
Oasis share of stockholders’ equity 3,636,138 3,734,576    
Non-controlling interests 0 0    
Total stockholders’ equity 3,636,138 3,734,576    
Total liabilities and stockholders’ equity 5,637,808 5,764,132    
Combined Guarantor Subsidiaries        
Assets, Current [Abstract]        
Cash and cash equivalents 15,705 15,362    
Accounts receivable, net 365,212 385,121    
Accounts receivable - affiliates 76,179 76,127    
Inventory 35,259 33,106    
Prepaid expenses 7,538 9,206    
Derivative instruments 535 99,930    
Intangible assets, net   125    
Other current assets 208 183    
Total current assets 500,636 619,160    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 9,485,504 8,923,291    
Other property and equipment 124,150 209,194    
Less: accumulated depreciation, depletion, amortization and impairment (3,665,933) (2,974,122)    
Total property, plant and equipment, net 5,943,721 6,158,363    
Assets held for sale, net 21,628      
Investments in and advances to subsidiaries 382,795 362,266    
Derivative instruments 639 6,945    
Deferred income taxes 0 0    
Long-term inventory 13,924 12,260    
Operating right-of-use assets 13,290      
Other assets 26,266 23,221    
Total assets 6,902,899 7,182,215    
Current liabilities        
Accounts payable 16,911 18,567    
Accounts payable - affiliates 576,780 724,404    
Revenues and production taxes payable 231,649 216,114    
Accrued liabilities 230,819 270,626    
Accrued interest payable 373 502    
Derivative instruments 19,695 84    
Advances from joint interest partners 4,598 5,140    
Current operating lease liabilities 3,177      
Other current liabilities 2,430      
Total current liabilities 1,086,432 1,235,437    
Long-term debt 337,000 468,000    
Deferred income taxes 517,003 519,725    
Asset retirement obligations 54,558 50,754    
Derivative instruments 120 20    
Operating lease liabilities 15,699      
Other liabilities 3,830 7,751    
Total liabilities 2,014,642 2,281,687    
Stockholders’ equity        
Oasis share of stockholders’ equity 4,888,257 4,900,528    
Non-controlling interests 0 0    
Total stockholders’ equity 4,888,257 4,900,528    
Total liabilities and stockholders’ equity 6,902,899 7,182,215    
Combined Non-Guarantor Subsidiaries        
Assets, Current [Abstract]        
Cash and cash equivalents 4,168 6,649    
Accounts receivable, net 5,969 2,481    
Accounts receivable - affiliates 77,571 81,022    
Inventory 0 22    
Prepaid expenses 1,923 1,418    
Derivative instruments 0 0    
Intangible assets, net   0    
Other current assets 138 0    
Total current assets 89,769 91,592    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 0 0    
Other property and equipment 1,155,503 942,578    
Less: accumulated depreciation, depletion, amortization and impairment (98,982) (62,730)    
Total property, plant and equipment, net 1,056,521 879,848    
Assets held for sale, net 0      
Investments in and advances to subsidiaries 0 0    
Derivative instruments 0 0    
Deferred income taxes 0 0    
Long-term inventory 0 0    
Operating right-of-use assets 5,207      
Other assets 3,172 2,452    
Total assets 1,154,669 973,892    
Current liabilities        
Accounts payable 1,037 1,599    
Accounts payable - affiliates 27,139 33,014    
Revenues and production taxes payable 1,441 581    
Accrued liabilities 50,210 60,954    
Accrued interest payable 508 442    
Derivative instruments 0 0    
Advances from joint interest partners 0 0    
Current operating lease liabilities 3,005      
Other current liabilities 594      
Total current liabilities 83,934 96,590    
Long-term debt 458,500 318,000    
Deferred income taxes 0 0    
Asset retirement obligations 1,747 1,630    
Derivative instruments 0 0    
Operating lease liabilities 2,216      
Other liabilities 3,644 0    
Total liabilities 550,041 416,220    
Stockholders’ equity        
Oasis share of stockholders’ equity 292,370 244,857    
Non-controlling interests 312,258 312,815    
Total stockholders’ equity 604,628 557,672    
Total liabilities and stockholders’ equity $ 1,154,669 $ 973,892