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Schedule of Accrued Expenses (Parenthetical) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Accrued Liabilities [Line Items]    
Payroll and related payables [1] $ 17,369 $ 17,344
Commissions payable [2] 2,146 1,898
Sonatide joint venture    
Schedule of Accrued Liabilities [Line Items]    
Commissions payable 37,600 $ 36,400
Former CEO    
Schedule of Accrued Liabilities [Line Items]    
Payroll and related payables $ 8,900  
[1] Includes an $8.9 million payable to the former CEO which was paid in May 2018.
[2] Excludes $37.6 million and $36.4 million of commissions due to Sonatide at March 31, 2018 and December 31, 2017,