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Related Party Transactions and Balances - Revenues (Expenses) from Related Party Transactions (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Related Party Transactions [Abstract]      
Revenue from Related Parties $ 49,228 $ 68,734 $ 68,172
Vessel operating expenses (34,629) (39,779) (39,237)
General and administrative (29,944) (52,257) (42,396)
Interest expense $ (22,400) $ (5,556) $ (933)