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Accrued Liabilities - Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accrued Liabilities [Line Items]    
Voyage and vessel expenses $ 6,437 $ 10,891
Audit, legal and other general expenses 6,882 8,435
Interest including interest rate swaps 20,162 19,606
Payroll and benefits 4,003 6,877
Income tax payable and other 650 931
Total $ 38,134 $ 46,740