Schedule of Accrued Expenses (Parenthetical) (Detail) - USD ($) $ in Thousands		Jun. 30, 2016	Mar. 31, 2016
Schedule of Accrued Liabilities [Line Items]
Commissions due	[1]	$ 6,840	$ 7,193
Sonatide joint venture
Schedule of Accrued Liabilities [Line Items]
Commissions due		52,000	32,000
Commissioner | Sonatide joint venture
Schedule of Accrued Liabilities [Line Items]
Commissions due		$ 51,800	$ 31,600

[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.