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Schedule of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Mar. 31, 2013
Other Assets, Accrued Expenses, Other Current Liabilities, And Other Liabilities And Deferred Credits [Abstract]    
Payroll and related payables $ 21,747 $ 23,453
Commissions payable 31,378 13,866
Accrued vessel expenses 103,098 103,177
Accrued interest expense 5,443 8,096
Other accrued expenses 6,519 10,494
Accrued expenses $ 168,185 $ 159,086