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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Jul. 31, 2017	Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net		$ 873	$ 2,709		$ 5,495
Loss before income taxes		(10,782)	(29,905)		(70,998)
Tax effect		4,745	1,278		10,396
Net loss attributable to Tidewater Inc.		(15,693)	(30,896)		(81,008)
Interest and other debt costs		5,240	$ 7,585		22,731
Predecessor
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net	$ 704			$ 3,974
Loss before income taxes	(1,124,028)			(1,733,396)
Tax effect	(1,529)			483
Net loss attributable to Tidewater Inc.	(1,122,475)			(1,741,763)
Interest and other debt costs	574			32,188
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss before income taxes		75			404
Net loss attributable to Tidewater Inc.		75			404
Reclassification out of Accumulated Other Comprehensive Income | Available for Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net		$ 75			$ 404
Reclassification out of Accumulated Other Comprehensive Income | Predecessor
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss before income taxes	26			2,571
Tax effect				1,027
Net loss attributable to Tidewater Inc.	26			1,544
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Available for Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net	$ 26			431
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Interest Rate Swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other debt costs				$ 2,140

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