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Schedule of Accrued Expenses (Parenthetical) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Mar. 31, 2017
Commissions payable [1] $ 2,488 $ 1,898  
Accrued interest expense 5,958 6,036  
Post-restructuring capital structure which includes debt   448,200  
Former CEO      
Commissions payable   9,600  
Predecessor      
Commissions payable     $ 2,143
Accrued interest expense     15,021
Sonatide joint venture      
Commissions payable $ 30,200 36,400  
Accrued interest expense   $ 36,400  
Sonatide joint venture | Predecessor      
Accrued interest expense     $ 34,700
[1] Excludes $30.2 million and $36.4 million of commissions due to Sonatide at June 30, 2018 and December 31, 2017, respectively. These amounts are included in amounts due to affiliates.