Fair Value Measurements and Derivative Instruments - Derivative Instruments (Details)					3 Months Ended		9 Months Ended						9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Interest rate swaps USD ($)	Dec. 31, 2013 Interest rate swaps USD ($)	Sep. 30, 2014 Forward Contracts USD ($)	Sep. 30, 2013 Forward Contracts USD ($)	Sep. 30, 2014 Forward Contracts USD ($)	Sep. 30, 2013 Forward Contracts USD ($)	Sep. 30, 2014 Forward Contracts Not Designated USD ($)	Jan. 31, 2014 Forward Contracts Designated as Hedging Instrument EUR (€)	Sep. 30, 2014 Foreign exchange contracts USD ($)	Dec. 31, 2013 Foreign exchange contracts USD ($)	Sep. 30, 2014 Cruise ships on order USD ($)
Gains and losses from derivatives involved in hedging relationships
Aggregate cost of ships on order, including the conditional agreement for a third Quantum - class ship													$ 6,000,000,000
Amount deposited for cost of ships on order, including the conditional agreement for a third Quantum - class ship													571,400,000
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate	29.30%	36.30%
Notional amount			2,900,000,000	3,000,000,000					556,700,000	415,600,000	3,500,000,000	2,500,000,000
Change in fair value of foreign currency forward contracts recognized in earnings					$ (35,100,000)	$ 16,900,000	$ (24,200,000)	$ (8,600,000)