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Schedule of Accrued Expenses (Parenthetical) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Schedule of Accrued Liabilities [Line Items]    
Commissions payable [1] $ 2,143 $ 7,193
Sonatide joint venture    
Schedule of Accrued Liabilities [Line Items]    
Commissions payable $ 34,700 $ 31,600
[1] Excludes $34.7 million and $31.6 million of commissions due to Sonatide at March 31, 2017 and 2016, respectively. These amounts are included in amounts due to affiliates.