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Schedule of Accrued Expenses (Parenthetical) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Mar. 31, 2015
Schedule of Accrued Liabilities [Line Items]    
Commissions due [1] $ 7,203 $ 8,282
Sonatide joint venture    
Schedule of Accrued Liabilities [Line Items]    
Commissions due 23,000 66,000
Commissioner | Sonatide joint venture    
Schedule of Accrued Liabilities [Line Items]    
Commissions due $ 22,600 $ 46,300
[1] Excludes $22.6 million and $46.3 million of commissions due to Sonatide at September 30, 2015 and March 31, 2015, respectively. These amounts are included in amounts due to affiliate.