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Reclassifications from Accumulated Other Comprehensive Loss to Condensed Consolidated Statement of Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net	$ 790	$ 622
Interest and other debt costs, net	(13,182)	(13,129)
Earnings (loss) before income taxes	(4,877)	57,491
Tax effect	10,287	13,792
Net earnings (loss) attributable to Tidewater Inc.	(15,052)	43,673
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings (loss) before income taxes	241	286
Tax effect		100
Net earnings (loss) attributable to Tidewater Inc.	241	186
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	62	108
Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and other debt costs, net	$ 179	$ 178

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