Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands		Jun. 30, 2016	Mar. 31, 2016
Accounts Payable and Accrued Liabilities Current [Abstract]
Payroll and related payables		$ 13,068	$ 12,864
Commissions payable	[1]	6,840	7,193
Accrued vessel expenses		41,939	45,838
Accrued interest expense		4,907	15,120
Other accrued expenses		5,213	10,596
Accrued expenses		$ 71,967	$ 91,611

[1] Excludes $51.8 million and $31.6 million of commissions due to Sonatide at June 30, 2016 and March 31, 2016, respectively. These amounts are included in amounts due to affiliate.