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Accrued liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Voyage and vessel $ 15,631 $ 30,112
Corporate accruals 504 19,255
Interest 2,527 4,742
Payroll and benefits to related parties 8,562 7,920
Total $ 27,224 $ 62,029