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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 483,864	$ 482,743	$ 529,405	$ 575,732	$ 599,755	$ 674,629	$ 573,751	$ 473,812	$ 2,071,744	$ 2,321,947	$ 1,293,719
Total expenses									1,912,866	2,231,522	1,151,525
Operating income (loss)	23,966	8,441	71,572	50,444	69,656	179,045	(242,674)	112,985	154,423	119,012	143,968
Net income (loss) including non-controlling interests	(64,154)	30,311	51,174	(107,978)	226,866	66,223	(316,301)	3,712	(90,647)	(19,500)	127,446
Net income (loss) attributable to Oasis	$ (76,406)	$ 20,288	$ 42,757	$ (114,882)	$ 221,977	$ 62,341	$ (320,204)	$ 590	$ (128,243)	$ (35,296)	$ 123,796
Basic earnings (loss) per share (in dollars per share)	$ (0.24)	$ 0.06	$ 0.14	$ (0.37)	$ 0.71	$ 0.20	$ (1.02)	$ 0.00	$ (0.41)	$ (0.11)	$ 0.53
Diluted earnings (loss) per share (in dollars per share)	$ (0.24)	$ 0.06	$ 0.14	$ (0.37)	$ 0.70	$ 0.20	$ (1.02)	$ 0.00	$ (0.41)	$ (0.11)	$ 0.52

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