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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Consolidated Statement of Income (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended						4 Months Ended	5 Months Ended	9 Months Ended	12 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	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, 2016	Dec. 31, 2018	Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net										$ 2,771		$ 11,294
Interest and debt costs incurred, net of interest capitalized										13,009		30,439
Loss before income taxes										(36,687)		(153,519)
Tax effect										2,039		18,252
Net loss attributable to Tidewater Inc.		$ (15,693)	$ (90,509)	$ (30,896)	$ (10,940)	$ (39,172)	$ (23,573)			(39,266)		(171,517)
Predecessor
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net									$ 2,384				$ 5,193
Interest and debt costs incurred, net of interest capitalized									11,179				75,026
Loss before income taxes									(1,648,143)		$ (558,359)		(643,614)
Tax effect									(1,234)		4,680		6,397
Net loss attributable to Tidewater Inc.	$ (1,122,475)							$ (524,434)	(1,646,909)		$ (565,263)		(660,118)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss before income taxes										169		(1,132)
Net loss attributable to Tidewater Inc.										169		(1,132)
Reclassification out of Accumulated Other Comprehensive Income | Realized Gains on Available for Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and debt costs incurred, net of interest capitalized										$ (169)		(404)
Reclassification out of Accumulated Other Comprehensive Income | Retiree Medical Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net												$ (1,536)
Reclassification out of Accumulated Other Comprehensive Income | Predecessor
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss before income taxes									106				2,935
Tax effect													1,027
Net loss attributable to Tidewater Inc.									106				1,908
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Realized Gains on Available for Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and debt costs incurred, net of interest capitalized									$ (106)				(582)
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Interest Rate Swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and debt costs incurred, net of interest capitalized													$ 2,353

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