Schedule of Accrued Expenses (Parenthetical) (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Mar. 31, 2015
Schedule of Accrued Liabilities [Line Items]
Commissions due	[1]	$ 7,197	$ 8,282
Sonatide joint venture
Schedule of Accrued Liabilities [Line Items]
Commissions due		27,000	66,000
Commissioner | Sonatide joint venture
Schedule of Accrued Liabilities [Line Items]
Commissions due		$ 27,300	$ 46,300

[1] Excludes $27.3 million and $46.3 million of commissions due to Sonatide at December 31, 2015 and March 31, 2015, respectively. These amounts are included in amounts due to affiliate.