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Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Voyage and vessel $ 19,404 $ 16,341
Corporate accruals 1,244 1,233
Interest and dividends 3,984 2,527
Payroll and benefits (note 14h) 9,976 8,562
Total $ 34,608 $ 28,663