Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Derivative instrument, Credit Risk Exposure

+ References

No definition available.

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- Definition

Maximum length of time over which the entity is hedging its exposure.

+ References

No definition available.

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- Definition

Percentage of Aggregate Cost Exposed to Fluctuations in the Euro Exchange Rate.

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No definition available.

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- Definition

Purchase Contract, Deposit.

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

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No definition available.

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- Definition

Nominal or face amount used to calculate payments on a nonderivative instrument.

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No definition available.

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Fair Value Measurements and Derivative Instruments - Derivative Instruments, Interest Rate Risk, Foreign Currency Exchange Rate Risk (Narrative) (Details) $ in Thousands, € in Millions	3 Months Ended				12 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Mar. 31, 2018 EUR (€)
Gains and losses from derivatives involved in hedging relationships
Derivative instrument, credit risk exposure	$ 273,400		$ 212,800
Maximum length of time hedged in derivative contract	3 years	3 years
Percentage of debt bearing fixed interest	60.90%		57.40%		57.40%		60.90%
Interest rate swaps
Gains and losses from derivatives involved in hedging relationships
Derivative, notional amount			$ 3,800,000		$ 3,800,000
Forward Contracts
Gains and losses from derivatives involved in hedging relationships
Change in fair value of foreign currency forward contracts recognized in earnings	$ 5,600			$ 13,800
Forward Contracts \| Not Designated
Gains and losses from derivatives involved in hedging relationships
Derivative, notional amount	770,500
Foreign exchange contracts
Gains and losses from derivatives involved in hedging relationships
Derivative, notional amount	4,000,000		$ 4,600,000		$ 4,600,000
Cruise ships on order
Gains and losses from derivatives involved in hedging relationships
Aggregate cost of ships on order, not including TUI cruises on order	11,700,000
Amount deposited for cost of ships on order	$ 419,000
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate	55.90%		54.00%		54.00%		55.90%
TUI Cruises \| Forward Contracts \| Designated as Hedging Instrument
Gains and losses from derivatives involved in hedging relationships
Derivative, notional amount	$ 124,200						€ 101.0
Foreign currency debt
Gains and losses from derivatives involved in hedging relationships
Carrying value of non-derivative instrument designated as hedging instrument	370,260				$ 295,323
Foreign currency debt \| TUI Cruises
Gains and losses from derivatives involved in hedging relationships
Carrying value of non-derivative instrument designated as hedging instrument	$ 370,600	€ 301.0			$ 295,300	€ 246.0