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Accrued liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Voyage and vessel $ 16,341 $ 32,897
Corporate accruals 1,233 19,820
Interest 2,527 4,742
Payroll and benefits to related parties 8,562 7,920
Total $ 28,663 $ 65,379