Fair Value Measurements and Derivative Instruments - Derivative Instruments, Interest Rate Risk, Foreign Currency Exchange Rate Risk (Narrative) (Details) $ in Thousands, € in Millions, T in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) T	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) T	Jun. 30, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 EUR (€) T
Gains and losses from derivatives involved in hedging relationships
Derivative instrument, credit risk exposure			$ 1,700
Maximum length of time hedged in derivative contract			3 years	3 years
Percentage of debt bearing fixed interest	66.30%		66.30%		62.10%			66.30%
Debt instrument, collateral amount	$ 20,200		$ 20,200
Scenario, Forecast
Gains and losses from derivatives involved in hedging relationships
Debt instrument, collateral amount							$ 73,600
Interest rate swaps
Gains and losses from derivatives involved in hedging relationships
Notional amount	3,500,000		3,500,000		$ 3,500,000
Forward Contracts
Gains and losses from derivatives involved in hedging relationships
Change in fair value of foreign currency forward contracts recognized in earnings	12,500	$ (4,200)
Forward Contracts | Not Designated
Gains and losses from derivatives involved in hedging relationships
Notional amount	275,100		275,100
Foreign exchange contracts
Gains and losses from derivatives involved in hedging relationships
Notional amount	$ 3,400,000		$ 3,400,000		$ 2,900,000
Fuel swaps
Gains and losses from derivatives involved in hedging relationships
Discontinued cash flow hedge, nonmonetary amount | T	0.3		0.3					0.3
Fuel swaps | Other income (expense)
Gains and losses from derivatives involved in hedging relationships
Discontinued cash flow hedge, reclassification loss			$ 68,600
Cruise ships on order
Gains and losses from derivatives involved in hedging relationships
Aggregate cost of ships on order, not including partner brands on order			13,900,000
Amount deposited for cost of ships on order	$ 833,100		$ 833,100
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate	62.50%		62.50%		65.90%			62.50%
TUI Cruises | Forward Contracts | Designated as Hedging Instrument
Gains and losses from derivatives involved in hedging relationships
Notional amount	$ 275,100		$ 275,100					€ 245.0
Foreign currency debt
Gains and losses from derivatives involved in hedging relationships
Carrying value of non-derivative instrument designated as hedging instrument			366,049		$ 358,078
Foreign currency debt | TUI Cruises
Gains and losses from derivatives involved in hedging relationships
Carrying value of non-derivative instrument designated as hedging instrument			$ 366,000	€ 326.0	$ 358,100	€ 319.0