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Summary of Significant Accounting Policies - Summary of Capitalized Dry Docking Costs (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Balance at the beginning of the year $ 8,106,247    
Balance at the end of the year 9,366,593 $ 8,106,247  
Dry-docking activity [Member]      
Property, Plant and Equipment [Line Items]      
Balance at the beginning of the year 135,331 118,194 $ 100,928
Costs incurred for dry dockings 69,927 74,018 72,545
Dry-dock amortization (47,271) (50,926) (50,325)
Write down / sales of vessels (7,285) (5,955) (4,954)
Balance at the end of the year $ 150,702 $ 135,331 $ 118,194