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Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts Payable and Accrued Liabilities Current [Abstract]    
Payroll and related payables $ 17,447 $ 17,344
Commissions payable [1] 1,990 1,898
Accrued vessel expenses 29,534 27,222
Accrued interest expense 5,985 6,036
Other accrued expenses [2] 6,828 2,306
Accrued expenses $ 61,784 $ 54,806
[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