Fair Value Measurements and Derivative Instruments - Interest Rate Risk (Details) - USD ($)		3 Months Ended	9 Months Ended
		Sep. 30, 2018	Sep. 30, 2018	Mar. 31, 2018
Interest Rate Fair Value Hedges [Abstract]
Unsecured term loan				$ 130,000,000.0
Interest rate swaps | Fair Value Hedging
Interest Rate Fair Value Hedges [Abstract]
Long-term debt		$ 772,500,000	$ 772,500,000
Interest rate swaps | Fair Value Hedging | Oasis of the Seas term loan
Interest Rate Fair Value Hedges [Abstract]
Long-term debt		$ 122,500,000	$ 122,500,000
Debt Fixed Rate		5.41%	5.41%
Interest rate swaps | Fair Value Hedging | Unsecured senior notes
Interest Rate Fair Value Hedges [Abstract]
Unsecured term loan		$ 650,000,000	$ 650,000,000
Debt Fixed Rate		5.25%	5.25%
Interest rate swaps | Cash flow hedge
Interest Rate Cash Flow Hedges [Abstract]
Swap notional amount		$ 2,781,601,000	$ 2,781,601,000
Interest rate swaps | Cash flow hedge | Celebrity Reflection term loan
Interest Rate Cash Flow Hedges [Abstract]
Swap notional amount		$ 354,521,000	$ 354,521,000
All-in Swap Fixed Rate		2.85%	2.85%
Interest rate swaps | Cash flow hedge | Quantum of the Seas term loan
Interest Rate Cash Flow Hedges [Abstract]
Swap notional amount		$ 520,625,000	$ 520,625,000
All-in Swap Fixed Rate		3.74%	3.74%
Interest rate swaps | Cash flow hedge | Anthem of the Seas term loan
Interest Rate Cash Flow Hedges [Abstract]
Swap notional amount		$ 543,750,000	$ 543,750,000
All-in Swap Fixed Rate		3.86%	3.86%
Interest rate swaps | Cash flow hedge | Ovation of the Seas term loan
Interest Rate Cash Flow Hedges [Abstract]
Swap notional amount		$ 691,667,000	$ 691,667,000
All-in Swap Fixed Rate		3.16%	3.16%
Interest rate swaps | Cash flow hedge | Harmony of the Seas term loan
Interest Rate Cash Flow Hedges [Abstract]
Swap notional amount	[1]	$ 671,038,000	$ 671,038,000
All-in Swap Fixed Rate	[1]	2.26%	2.26%
LIBOR
Interest Rate Cash Flow Hedges [Abstract]
Debt Floating Rate		1.195%
LIBOR | Interest rate swaps | Fair Value Hedging | Oasis of the Seas term loan
Interest Rate Fair Value Hedges [Abstract]
Swap Floating Rate: LIBOR plus		3.87%	3.87%
All-in swap floating rate		6.39%	6.39%
LIBOR | Interest rate swaps | Fair Value Hedging | Unsecured senior notes
Interest Rate Fair Value Hedges [Abstract]
Swap Floating Rate: LIBOR plus		3.63%	3.63%
All-in swap floating rate		5.95%	5.95%
LIBOR | Interest rate swaps | Cash flow hedge | Celebrity Reflection term loan
Interest Rate Cash Flow Hedges [Abstract]
Debt Floating Rate			0.40%
LIBOR | Interest rate swaps | Cash flow hedge | Quantum of the Seas term loan
Interest Rate Cash Flow Hedges [Abstract]
Debt Floating Rate			1.30%
LIBOR | Interest rate swaps | Cash flow hedge | Anthem of the Seas term loan
Interest Rate Cash Flow Hedges [Abstract]
Debt Floating Rate			1.30%
LIBOR | Interest rate swaps | Cash flow hedge | Ovation of the Seas term loan
Interest Rate Cash Flow Hedges [Abstract]
Debt Floating Rate			1.00%
EURIBOR | Interest rate swaps | Cash flow hedge | Harmony of the Seas term loan
Interest Rate Cash Flow Hedges [Abstract]
Debt Floating Rate	[1]		1.15%

[1] Interest rate swap agreements hedging the Euro-denominated term loan for Harmony of the Seas include EURIBOR zero-floor matching the hedged debt EURIBOR zero-floor. Amount presented is based on the exchange rate as of September 30, 2018.