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Summary of Significant Accounting Policies - Impact of Revision of Prior Period Financial Statements on Consolidated Financial Statements (Details) - 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
Accounting Changes and Error Corrections [Abstract]
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 operating expenses		532,453	818,379	360,827	350,546	287,889	255,430	257,660	2,231,522	1,151,525	834,195
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)
Accounts receivable, net	$ 387,602				$ 371,379				$ 387,602	$ 371,379
Total current assets	554,155				415,634				554,155	415,634
Total assets	7,626,142				6,622,929				7,626,142	6,622,929	$ 6,178,632
Accrued liabilities	331,651				244,279				331,651	244,279
Total current liabilities	611,776				631,279				611,776	631,279
Liabilities	3,707,262				3,109,350				3,707,262	3,109,350
Oasis share of stockholders’ equity	$ 3,734,576				3,375,691				3,734,576	3,375,691
Oil and gas
Accounting Changes and Error Corrections [Abstract]
Total revenues		$ 454,195	$ 397,849	$ 366,595	330,290	$ 248,576	$ 218,523	$ 237,245	1,590,024	1,034,634	625,233
Purchased oil and gas
Accounting Changes and Error Corrections [Abstract]
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
Year Ended December 31, 2017
Accounting Changes and Error Corrections [Abstract]
Total revenues		546,448	501,337	421,216	404,469	304,748	254,091	285,116		1,248,424
Total operating expenses		404,272	745,965	308,231	320,140	272,354	248,712	265,024		1,106,230
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
Accounts receivable, net					$ 363,580					$ 363,580
Total current assets					407,835					407,835
Total assets					6,615,130					6,615,130
Accrued liabilities					236,480					236,480
Total current liabilities					623,480					623,480
Liabilities					3,101,551					3,101,551
Oasis share of stockholders’ equity					3,375,691					3,375,691
Year Ended December 31, 2017 | Oil and gas
Accounting Changes and Error Corrections [Abstract]
Total revenues		$ 452,643	$ 395,921	$ 363,671	330,359	$ 248,648	$ 218,633	$ 237,252		1,034,892
Year Ended December 31, 2017 | Purchased oil and gas
Accounting Changes and Error Corrections [Abstract]
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
Revision
Accounting Changes and Error Corrections [Abstract]
Total revenues		128,181	72,414	52,596	30,406	15,535	6,718	(7,364)		45,295
Total operating expenses		128,181	72,414	52,596	30,406	15,535	6,718	(7,364)		45,295
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
Accounts receivable, net					$ 7,799					$ 7,799
Total current assets					7,799					7,799
Total assets					7,799					7,799
Accrued liabilities					7,799					7,799
Total current liabilities					7,799					7,799
Liabilities					7,799					7,799
Oasis share of stockholders’ equity					0					0
Revision | Oil and gas
Accounting Changes and Error Corrections [Abstract]
Total revenues		$ 1,552	$ 1,928	$ 2,924	(69)	$ (72)	$ (110)	$ (7)		(258)
Revision | Purchased oil and gas
Accounting Changes and Error Corrections [Abstract]
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

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