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Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accounts Payable and Accrued Liabilities Current [Abstract]    
Payroll and related payables [1] $ 9,004 $ 17,344
Commissions payable [2] 2,488 1,898
Accrued vessel expenses 28,701 27,222
Accrued interest expense 5,958 6,036
Other accrued expenses 3,161 2,306
Accrued expenses $ 49,312 $ 54,806
[1] The balance at December 31, 2017 includes $8.9 million payable to the former CEO, which was paid in May 2018.
[2] Excludes $30.2 million and $36.4 million of commissions due to Sonatide at June 30, 2018 and December 31, 2017,