Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Revenue	$ 1,009,985	$ 647,684	$ 371,033
Costs and expenses:
Vessel operating costs	556,515	397,301	261,814
Costs of other operating revenues	4,342	2,130	2,231
General and administrative	95,283	101,921	68,516
Depreciation and amortization	180,331	119,160	114,544
(Gain) loss on asset dispositions, net	(8,701)	(250)	2,901
Affiliate credit loss impairment expense	0	0	400
Long-lived asset impairments and other	0	714	15,643
Total costs and expenses	827,770	620,976	466,049
Operating income (loss)	182,215	26,708	(95,016)
Other income (expense):
Foreign exchange loss	(1,370)	(2,827)	(369)
Equity in net earnings (losses) of unconsolidated companies	39	(221)	(3,322)
Interest income and other, net	6,517	5,397	1,605
Loss on warrants	0	(14,175)	0
Loss on early extinguishment of debt	0	0	(11,100)
Interest and other debt costs, net	(48,472)	(17,189)	(15,583)
Total other expense	(43,286)	(29,015)	(28,769)
Income (loss) before income taxes	138,929	(2,307)	(123,785)
Income tax expense	43,308	19,886	5,875
Net income (loss)	95,621	(22,193)	(129,660)
Less: Net losses attributable to noncontrolling interests	(1,564)	(444)	(691)
Net income (loss) attributable to Tidewater Inc.	$ 97,185	$ (21,749)	$ (128,969)
Basic income (loss) per common share (in dollars per share)	$ 1.88	$ (0.49)	$ (3.14)
Diluted income (loss) per common share (in dollars per share)	$ 1.84	$ (0.49)	$ (3.14)
Weighted average common shares outstanding (in shares)	51,591	44,132	41,009
Dilutive effect of warrants, restricted stock units and stock options (in shares)	1,346	0	0
Adjusted weighted average common shares (in shares)	52,937	44,132	41,009
Vessel [Member]
Revenues:
Revenue	$ 998,993	$ 641,404	$ 361,569
Product and Service, Other [Member]
Revenues:
Revenue	$ 10,992	$ 6,280	$ 9,464