Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Revenue	$ 163,447	$ 89,953	$ 269,176	$ 173,457
Costs and expenses:
Vessel operating costs	100,257	64,263	168,768	125,283
Costs of other operating revenues	483	581	844	1,648
General and administrative	27,804	16,787	46,021	32,830
Depreciation and amortization	31,766	28,549	58,423	58,276
Long-lived asset impairment credit	0	0	500	0
Affiliate credit loss impairment credit	0	(1,000)	0	(1,000)
Loss on asset dispositions, net	1,297	932	1,090	2,880
Total costs and expenses	161,607	110,112	274,646	219,917
Operating income (loss)	1,840	(20,159)	(5,470)	(46,460)
Other income (expense):
Foreign exchange gain (loss)	(1,881)	422	(935)	(428)
Equity in net earnings (losses) of unconsolidated companies	(244)	52	(244)	(1,797)
Interest income and other, net	349	8	3,835	31
Loss on warrants	(14,175)	0	(14,175)	0
Interest and other debt costs, net	(4,284)	(3,944)	(8,459)	(8,485)
Total other expense	(20,235)	(3,462)	(19,978)	(10,679)
Loss before income taxes	(18,395)	(23,621)	(25,448)	(57,139)
Income tax expense	6,619	6,026	11,837	8,035
Net loss	(25,014)	(29,647)	(37,285)	(65,174)
Net income (loss) attributable to noncontrolling interests	567	(185)	464	(397)
Net loss attributable to Tidewater Inc.	$ (25,581)	$ (29,462)	$ (37,749)	$ (64,777)
Basic loss per common share (in dollars per share)	$ (0.61)	$ (0.72)	$ (0.91)	$ (1.59)
Diluted loss per common share (in dollars per share)	$ (0.61)	$ (0.72)	$ (0.91)	$ (1.59)
Weighted average common shares outstanding (in shares)	41,814	40,899	41,614	40,808
Adjusted weighted average common shares (in shares)	41,814	40,899	41,614	40,808
Vessel [Member]
Revenues:
Revenue	$ 162,175	$ 88,514	$ 266,051	$ 169,507
Product and Service, Other [Member]
Revenues:
Revenue	$ 1,272	$ 1,439	$ 3,125	$ 3,950