Condensed Consolidated Statements of Operations (Unuadited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues:
Revenue	$ 214,961	$ 163,447	$ 408,065	$ 269,176
Costs and expenses:
Vessel operating costs	118,264	100,257	233,723	168,768
Costs of other operating revenues	373	483	1,524	844
General and administrative	26,013	27,804	49,558	46,021
Depreciation and amortization	32,768	31,766	63,434	58,423
Long-lived asset impairment credit	0	0	0	(500)
(Gain) loss on asset dispositions, net	(1,404)	1,297	(3,620)	1,090
Total costs and expenses	176,014	161,607	344,619	274,646
Operating income (loss)	38,947	1,840	63,446	(5,470)
Other income (expense):
Foreign exchange loss	(3,819)	(1,881)	(1,471)	(935)
Equity in net earnings (losses) of unconsolidated companies	25	(244)	25	(244)
Interest income and other, net	2,790	349	2,920	3,835
Loss on warrants	0	(14,175)	0	(14,175)
Interest and other debt costs, net	(4,731)	(4,284)	(8,921)	(8,459)
Total other expense	(5,735)	(20,235)	(7,447)	(19,978)
Income (loss) before income taxes	33,212	(18,395)	55,999	(25,448)
Income tax expense	11,284	6,619	23,255	11,837
Net income (loss)	21,928	(25,014)	32,744	(37,285)
Net income (loss) attributable to noncontrolling interests	(656)	567	(578)	464
Net income (loss) attributable to Tidewater Inc.	$ 22,584	$ (25,581)	$ 33,322	$ (37,749)
Basic income (loss) per common share (in dollars per share)	$ 0.44	$ (0.61)	$ 0.66	$ (0.91)
Diluted income (loss) per common share (in dollars per share)	$ 0.43	$ (0.61)	$ 0.64	$ (0.91)
Weighted average common shares outstanding (in shares)	50,857	41,814	50,731	41,614
Dilutive effect of warrants, restricted stock units and stock options (in shares)	1,148	0	1,260	0
Adjusted weighted average common shares (in shares)	52,005	41,814	51,991	41,614
Vessel [Member]
Revenues:
Revenue	$ 210,323	$ 162,175	$ 401,503	$ 266,051
Product and Service, Other [Member]
Revenues:
Revenue	$ 4,638	$ 1,272	$ 6,562	$ 3,125