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Related Party Transactions - Schedule of Related Party Transactions (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]      
Voyage revenues $ 397,991 $ 402,928 $ 399,276
General and administrative expenses (25,118) (23,860) (20,444)
Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Voyage revenues 35,887 37,596 34,573
Vessel operating expenses (19,914) (12,703) (10,847)
General and administrative expenses $ (14,485) $ (13,708) $ (11,959)