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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net									$ 5,193	$ 2,703	$ 1,927
Interest and other debt costs									75,026	53,752	50,029
Loss before income taxes									(643,614)	(139,557)	(66,426)
Tax effect									6,397	20,819	(1,077)
Net loss attributable to Tidewater Inc.	$ (94,855)	$ (297,676)	$ (178,490)	$ (89,097)	$ (81,787)	$ (19,509)	$ (43,835)	$ (15,052)	(660,118)	(160,183)	$ (65,190)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss before income taxes									2,935	420
Tax effect									1,027	147
Net loss attributable to Tidewater Inc.									1,908	273
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									582	200
Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other debt costs									$ 2,353	$ 220

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Interest and debt related expenses associated with nonoperating financing activities of the entity.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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