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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) (USD $)	3 Months Ended			1 Months Ended	3 Months Ended		3 Months Ended		1 Months Ended		3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014	Nov. 30, 2013 Sonatide joint venture	Jun. 30, 2014 Sonatide joint venture Vessel	Mar. 31, 2014 Sonatide joint venture	Jun. 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	Jun. 30, 2014 Sonatide joint venture Sonatide's conversion of kwanzas to 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	Jun. 30, 2014 Sonatide joint venture ANGOLA Vessel	Jun. 30, 2013 Sonatide joint venture ANGOLA Vessel	Jun. 30, 2014 Sonatide joint venture Increase ANGOLA Vessel	Jun. 30, 2014 Sonatide joint venture Trade and other receivables	Mar. 31, 2014 Sonatide joint venture Trade and other receivables	Jun. 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					$ 430,000,000
Customer agreements that contain split currency									70.00%	30.00%
Proceeds from related party					91,000,000		59,000,000	32,000,000
Vessel revenues	381,510,000	331,630,000			87,000,000						87,000,000	98,000,000
Percentage of Angolan operation revenue											23.00%	29.00%
Number of vessels operating					10						83	88	1
Number of vessels stacked											4	5
Ownership Interest In Joint Venture					49.00%
Investments in, at equity, and advances to unconsolidated companies	67,926,000		63,928,000		66,000,000	62,000,000
Due from related parties														430,000,000	430,000,000
Due to related parties																118,000,000	86,000,000
Commissions payable	$ 6,785,000		$ 8,263,000													$ 51,000,000	$ 43,000,000

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