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Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
Accounts Payable and Accrued Liabilities Current [Abstract]    
Payroll and related payables $ 11,301 $ 12,864
Commissions payable 4,140 7,193
Accrued vessel expenses 37,849 45,838
Accrued interest expense 4,902 15,120
Other accrued expenses 9,220 10,596
Total accrued expenses $ 67,412 $ 91,611