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Basis of Presentation - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]    
Advances on newbuilding contracts and conversion costs $ 1,403,850 $ 796,324
Reclassification to advances on newbuilding contracts and conversion costs [Member]
   
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]    
Advances on newbuilding contracts and conversion costs   $ 29,800