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Schedule of Accrued Expenses (Detail) - Entity [Domain] - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Other Assets, Accrued Expenses, Other Current Liabilities, And Other Liabilities And Deferred Credits [Abstract]    
Payroll and related payables $ 30,228 $ 32,041
Commissions payable 6,288 8,282
Accrued vessel expenses 70,737 79,549
Accrued interest expense 4,809 14,514
Other accrued expenses 6,100 11,869
Accrued expenses $ 118,162 $ 146,255