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Schedule of Accrued Expenses (Parenthetical) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Schedule of Accrued Liabilities [Line Items]    
Commissions payable [1] $ 1,990 $ 1,898
Other accrued expenses [2] 6,828 2,306
Sonatide joint venture    
Schedule of Accrued Liabilities [Line Items]    
Commissions payable 28,000 $ 36,400
St. Rose and New Orleans, Louisiana, Houston Texas and Aberdeen, Scotland    
Schedule of Accrued Liabilities [Line Items]    
Other accrued expenses 1,500  
Charge incurred on abandonment of office leases $ 5,500  
[1] Excludes $28.0 million and $36.4 million of commissions due to Sonatide at December 31, 2018 and 2017, respectively. These amounts are included in amounts due to affiliates.
[2] Includes $1.5 million as of December 31, 2018 related to a $5.5 million charge incurred during the twelve months ended December 31, 2018 relating to the abandonment of office leases for duplicate facilities in St. Rose and New Orleans, Louisiana, Houston Texas and Aberdeen, Scotland