Fair Value Measurements and Derivative Instruments (Non-Derivative Instruments) (Details) - Foreign currency debt $ in Thousands, € in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)
Net investment hedge
Carrying Value of Non-derivative instrument Designated as hedging instrument	$ 320,152		$ 295,323
Pullmantur and TUI Cruises
Net investment hedge
Carrying Value of Non-derivative instrument Designated as hedging instrument	320,200	€ 280.0	295,300	€ 246.0
Current portion of long-term debt
Net investment hedge
Carrying Value of Non-derivative instrument Designated as hedging instrument	38,168		70,097
Long-term debt
Net investment hedge
Carrying Value of Non-derivative instrument Designated as hedging instrument	$ 281,984		$ 225,226