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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, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net									$ 2,703	$ 1,927	$ 2,123
Interest and other debt costs									53,752	50,029	43,814
Earnings (loss) before income taxes									(139,557)	(66,426)	173,048
Tax effect									20,819	(1,077)	32,793
Net earnings (loss) attributable to Tidewater Inc.	$ (81,787)	$ (19,509)	$ (43,835)	$ (15,052)	$ (9,076)	$ (160,694)	$ 60,907	$ 43,673	(160,183)	(65,190)	$ 140,255
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings (loss) before income taxes									420	924
Tax effect									147
Net earnings (loss) attributable to Tidewater Inc.									273	924
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									200	207
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									$ 220	$ 717

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and 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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