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Schedule of Accrued Cost and Expenses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accounts Payable and Accrued Liabilities Current [Abstract]    
Payroll and related payables $ 17,126 $ 17,447
Commissions payable [1] 2,320 1,990
Accrued vessel expenses 28,223 29,534
Accrued interest expense 5,915 5,985
Other accrued expenses 2,441 6,828
Accrued cost and expenses $ 56,025 $ 61,784
[1] Excludes $29.4 million and $28.0 million of commissions due to Sonatide at March 31, 2019 and December 31, 2018, respectively. These amounts are included in amounts due to affiliate.