Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Accounts Payable and Accrued Liabilities Current [Abstract]
Payroll and related payables	$ 12,864	$ 32,041
Commissions payable	7,193	8,282
Accrued vessel expenses	45,838	79,549
Accrued interest expense	15,120	14,514
Other accrued expenses	10,596	11,869
Accrued expenses	$ 91,611	$ 146,255