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Selected Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended										4 Months Ended	5 Months Ended	12 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	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, 2017	Jun. 30, 2017	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 36,263	$ 74,300	$ 118,776	$ 119,765	$ 125,859	$ 122,149	$ 110,234	$ 99,192	$ 105,601	$ 91,493	$ 104,453	$ 115,106
Impairment of due from affiliate							(20,083)									$ (20,083)
Asset impairments and other included in operating loss	(21,325)		(32,549)	(5,224)			(36,878)	(16,853)	(1,215)	(6,186)	(16,777)	(163,423)	$ (184,748)	$ (16,777)	$ (37,773)	(61,132)
Operating loss	(38,674)	(5,782)	(50,039)	(22,551)	(4,394)	(9,620)	(70,077)	(25,086)	(140)	(12,194)	(18,091)	(205,374)	(244,048)	(23,873)	(86,604)	(107,497)
Net loss attributable to Tidewater Inc.	$ (1,122,475)	$ (15,693)	$ (59,853)	$ (44,200)	$ (15,959)	$ (21,731)	$ (90,509)	$ (30,896)	$ (10,940)	$ (39,172)	$ (23,573)	$ (524,434)	$ (1,646,909)	$ (39,266)	$ (141,743)	$ (171,517)
Basic loss per share attributable to Tidewater Inc.	$ (23.82)	$ (0.81)	$ (1.52)	$ (1.15)	$ (0.42)	$ (0.58)	$ (2.83)	$ (1.16)	$ (0.44)	$ (1.67)	$ (1.02)	$ (11.13)	$ (34.95)	$ (1.82)	$ (3.71)	$ (6.45)
Diluted loss per share attributable to Tidewater Inc.	$ (23.82)	$ (0.81)	$ (1.52)	$ (1.15)	$ (0.42)	$ (0.58)	$ (2.83)	$ (1.16)	$ (0.44)	$ (1.67)	$ (1.02)	$ (11.13)	$ (34.95)	$ (1.82)	$ (3.71)	$ (6.45)

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