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Accrued Liabilities - Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Interest including interest rate swaps $ 17,484 $ 17,035
Voyage and vessel expenses 9,315 7,829
Payroll and benefits 5,431 5,560
Other general expenses 2,785 4,224
Income tax payable and other 2,441 4,389
Total $ 37,456 $ 39,037