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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended			1 Months Ended	6 Months Ended		6 Months Ended		1 Months Ended		6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014	Nov. 30, 2013 Sonatide joint venture	Sep. 30, 2014 Sonatide joint venture Vessel	Mar. 31, 2014 Sonatide joint venture	Sep. 30, 2014 Sonatide joint venture Dollars held by Sonatide that did not need to be converted to U.S dollars prior to payment to Tidewate	Sep. 30, 2014 Sonatide joint venture Sonatide's converting kwanzas into dollars and subsequent payment to Tidewater	Feb. 28, 2014 Sonatide joint venture United States of America, Dollars	Feb. 28, 2014 Sonatide joint venture Angola, Kwanza	Sep. 30, 2014 Sonatide joint venture ANGOLA Vessel	Sep. 30, 2013 Sonatide joint venture ANGOLA Vessel	Mar. 31, 2014 Sonatide joint venture Increase ANGOLA Vessel	Sep. 30, 2014 Sonatide joint venture Trade and other receivables	Mar. 31, 2014 Sonatide joint venture Trade and other receivables	Sep. 30, 2014 Sonatide joint venture Accrued expenses	Mar. 31, 2014 Sonatide joint venture Accrued expenses
Commitments and Contingencies Disclosure [Line Items]
Definitive joint venture agreement term						2 years
Due from related parties							$ 408,000,000
Customer agreements that contain split currency											70.00%	30.00%
Proceeds from related party							186,000,000		104,000,000	82,000,000
Vessel revenues	390,952,000	363,668,000	772,462,000	695,298,000			179,000,000						179,000,000	168,000,000
Percentage of Angolan operation revenue													23.00%	24.00%
Number of vessels operating							10						83	86	1
Number of vessels stacked							4						5	11
Ownership Interest In Joint Venture							49.00%
Investments in, at equity, and advances to unconsolidated companies	70,803,000		70,803,000		63,928,000		70,000,000	62,000,000
Due from related parties																408,000,000	430,000,000
Due to related parties																		127,000,000	86,000,000
Commissions payable	$ 7,079,000		$ 7,079,000		$ 8,263,000													$ 48,000,000	$ 43,000,000
Ownership percentage requirement of local vessel operators													100.00%
Number of vessels transferred out of Angola													10
Number of vessels stacked													4

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