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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 | 9 Months Ended | 12 Months Ended |
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Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 EUR (€) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Sep. 30, 2018 EUR (€)
Gains and losses from derivatives involved in hedging relationships |  |  |  |  |  |  |  |  |
Derivative instrument, credit risk exposure | $ 234,900 | $ 212,800 |  |  |  |  |  |  |
Maximum length of time hedged in derivative contract |  |  |  | 3 years | 3 years |  |  |  |
Percentage of debt bearing fixed interest | 57.20% | 57.40% |  | 57.20% |  |  | 57.40% |  | 57.20%
Interest rate swaps |  |  |  |  |  |  |  |  |
Gains and losses from derivatives involved in hedging relationships |  |  |  |  |  |  |  |  |
Derivative, notional amount | $ 3,600,000 | $ 3,800,000 |  | $ 3,600,000 |  |  | $ 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 | (12,100) |  | $ 22,000 | (43,400) |  | $ 57,100 |  |  |
Forward Contracts | Not Designated |  |  |  |  |  |  |  |  |
Gains and losses from derivatives involved in hedging relationships |  |  |  |  |  |  |  |  |
Derivative, notional amount | 790,800 |  |  | 790,800 |  |  |  |  |
Foreign exchange contracts |  |  |  |  |  |  |  |  |
Gains and losses from derivatives involved in hedging relationships |  |  |  |  |  |  |  |  |
Derivative, notional amount | 4,000,000 | $ 4,600,000 |  | 4,000,000 |  |  | $ 4,600,000 |  |
Cruise ships on order |  |  |  |  |  |  |  |  |
Gains and losses from derivatives involved in hedging relationships |  |  |  |  |  |  |  |  |
Aggregate cost of ships on order, not including partner brands on order |  |  |  | 12,200,000 |  |  |  |  |
Amount deposited for cost of ships on order | $ 656,800 |  |  | $ 656,800 |  |  |  |  |
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate | 54.30% | 54.00% |  | 54.30% |  |  | 54.00% |  | 54.30%
TUI Cruises | Forward Contracts | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Gains and losses from derivatives involved in hedging relationships |  |  |  |  |  |  |  |  |
Derivative, notional amount | $ 117,300 |  |  | $ 117,300 |  |  |  |  | € 101.0
Foreign currency debt |  |  |  |  |  |  |  |  |
Gains and losses from derivatives involved in hedging relationships |  |  |  |  |  |  |  |  |
Carrying value of non-derivative instrument designated as hedging instrument |  |  |  | 329,809 |  |  | $ 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 |  |  |  | $ 329,800 | € 284.0 |  | $ 295,300 | € 246.0 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References 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 + Details
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