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Commitments and Contingencies - Additional Information (Detail Textuals)

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Commitments and Contingencies - Additional Information (Detail Textuals) - 9 months ended Sep. 30, 2015 - Ship Construction Contracts
€ in Millions, $ in Millions
USD ($)
CruiseShip
Gross_Ton
Berth
EUR (€)
CruiseShip
Gross_Ton
Berth
Commitments and Contingencies Disclosure [Line Items]    
Scheduled delivery date of ships under construction spring of 2017, spring of 2018 and fall of 2019  
Cruise ships to be built 3 3
Capacity of ship, tons | Gross_Ton 164,600 164,600
Capacity of ship, berths | Berth 4,000 4,000
Aggregate contract price of new ships $ 2,800.0 € 2,500.0
Export credit facility financing as percentage of contract prices 80.00% 80.00%
Fincantieri Shipyard    
Commitments and Contingencies Disclosure [Line Items]    
Aggregate contract price of new ships $ 410.4 € 367.2
Export credit facility financing as percentage of contract prices 80.00% 80.00%