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Schedule of Accrued Expenses (Parenthetical) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Schedule of Accrued Liabilities [Line Items]    
Commissions payable [1] $ 2,139  
Predecessor    
Schedule of Accrued Liabilities [Line Items]    
Commissions payable [1]   $ 2,143
Sonatide joint venture    
Schedule of Accrued Liabilities [Line Items]    
Commissions payable $ 34,400  
Sonatide joint venture | Predecessor    
Schedule of Accrued Liabilities [Line Items]    
Commissions payable   $ 34,700
[1] Excludes $34.4 million and $34.7 million of commissions due to Sonatide at September 30, 2017 and March 31, 2017, respectively. These amounts are included in amounts due to affiliate.