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Selected Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Quarterly Financial Data [Line Items]
Revenues	$ 324,762us-gaap_Revenues		$ 387,554us-gaap_Revenues		$ 397,524us-gaap_Revenues		$ 385,677us-gaap_Revenues		$ 367,833us-gaap_Revenues		$ 365,248us-gaap_Revenues		$ 367,937us-gaap_Revenues		$ 334,085us-gaap_Revenues		$ 1,495,517us-gaap_Revenues	$ 1,435,103us-gaap_Revenues	$ 1,244,165us-gaap_Revenues
Operating income (loss)	25,672us-gaap_OperatingIncomeLoss	[1]	(213,580)us-gaap_OperatingIncomeLoss	[1]	84,723us-gaap_OperatingIncomeLoss	[1]	66,004us-gaap_OperatingIncomeLoss	[1]	61,063us-gaap_OperatingIncomeLoss	[1]	20,488us-gaap_OperatingIncomeLoss	[1]	76,565us-gaap_OperatingIncomeLoss	[1]	43,425us-gaap_OperatingIncomeLoss	[1]	(37,181)us-gaap_OperatingIncomeLoss	201,541us-gaap_OperatingIncomeLoss	206,232us-gaap_OperatingIncomeLoss
Net earnings attributable to Tidewater Inc.	$ (9,076)us-gaap_NetIncomeLoss		$ (160,694)us-gaap_NetIncomeLoss		$ 60,907us-gaap_NetIncomeLoss		$ 43,673us-gaap_NetIncomeLoss		$ 43,417us-gaap_NetIncomeLoss		$ 12,583us-gaap_NetIncomeLoss		$ 54,172us-gaap_NetIncomeLoss		$ 30,083us-gaap_NetIncomeLoss		$ (65,190)us-gaap_NetIncomeLoss	$ 140,255us-gaap_NetIncomeLoss	$ 150,750us-gaap_NetIncomeLoss
Basic earnings per share attributable to Tidewater Inc.	$ (0.19)us-gaap_EarningsPerShareBasic		$ (3.31)us-gaap_EarningsPerShareBasic		$ 1.23us-gaap_EarningsPerShareBasic		$ 0.88us-gaap_EarningsPerShareBasic		$ 0.88us-gaap_EarningsPerShareBasic		$ 0.25us-gaap_EarningsPerShareBasic		$ 1.10us-gaap_EarningsPerShareBasic		$ 0.61us-gaap_EarningsPerShareBasic		$ (1.34)us-gaap_EarningsPerShareBasic	$ 2.84us-gaap_EarningsPerShareBasic	$ 3.04us-gaap_EarningsPerShareBasic
Diluted earnings per share attributable to Tidewater Inc.	$ (0.19)us-gaap_EarningsPerShareDiluted		$ (3.31)us-gaap_EarningsPerShareDiluted		$ 1.22us-gaap_EarningsPerShareDiluted		$ 0.88us-gaap_EarningsPerShareDiluted		$ 0.88us-gaap_EarningsPerShareDiluted		$ 0.25us-gaap_EarningsPerShareDiluted		$ 1.09us-gaap_EarningsPerShareDiluted		$ 0.61us-gaap_EarningsPerShareDiluted		$ (1.34)us-gaap_EarningsPerShareDiluted	$ 2.82us-gaap_EarningsPerShareDiluted	$ 3.03us-gaap_EarningsPerShareDiluted
[1] Operating income consists of revenues less operating costs and expenses, depreciation, vessel operating leases, goodwill impairment, general and administrative expenses and gain on asset dispositions, net, of the company's operations. Goodwill impairment by quarter for fiscal 2015 and 2014 and gain on asset dispositions, net, by quarter for fiscal 2015 and 2014, are as follows:

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