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Commitments and Contingencies (Sonatide Joint Venture) - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended	3 Months Ended		1 Months Ended		12 Months Ended			12 Months Ended
	Mar. 31, 2014 Vessel	Mar. 31, 2013 Vessel	Mar. 31, 2012	Nov. 30, 2013 Sonatide joint venture	Mar. 31, 2014 Sonatide joint venture Vessel	Mar. 31, 2013 Sonatide joint venture	Feb. 28, 2014 Sonatide joint venture United States of America, Dollars	Feb. 28, 2014 Sonatide joint venture Angola, Kwanza	Mar. 31, 2014 Sonatide joint venture ANGOLA Vessel	Mar. 31, 2013 Sonatide joint venture ANGOLA Vessel	Mar. 31, 2014 Sonatide joint venture Increase ANGOLA Vessel	Mar. 31, 2014 Sonatide joint venture Subsequent Event	Mar. 31, 2014 Sonatide joint venture Trade and other receivables	Mar. 31, 2013 Sonatide joint venture Trade and other receivables	Mar. 31, 2014 Sonatide joint venture Accrued expenses	Mar. 31, 2013 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
Proceeds from customers					67,000,000
Customer agreements that contain split currency							70.00%	30.00%
Number of vessels operating	272	309			10				90	85	1
Vessel revenues	1,418,461,000	1,229,998,000	1,060,468,000						356,800,000	271,000,000
Percentage of Angolan operation revenue									25.00%	22.00%
Number of vessels stacked									5	9
Ownership Interest In Joint Venture					49.00%
Investments in, at equity, and advances to unconsolidated companies	63,928,000	46,047,000	46,077,000		62,000,000	46,000,000
Due from related parties													430,000,000	119,000,000
Due to related parties															86,000,000	36,000,000
Commissions payable	8,263,000	7,118,000													43,000,000	7,000,000
Proceeds from related party												$ 66,000,000
Equivalent revenue days for the cash collected from affliate												62 days

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