(Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net (Loss) Income attributable to Royal Caribbean Cruises Ltd. for basic and diluted earnings per share	$ (1,346,756)	$ 883,240	$ (4,430,527)	$ 1,605,751
Weighted-average common shares outstanding (in shares)	214,163	209,575	210,894	209,477
Dilutive effect of stock-based awards (in shares)	0	546	0	555
Diluted weighted-average shares outstanding (in shares)	214,163	210,121	210,894	210,032
Basic (loss) earnings per share (in dollars per share)	$ (6.29)	$ 4.21	$ (21.01)	$ 7.67
Diluted (loss) earnings per share (in dollars per share)	$ (6.29)	$ 4.20	$ (21.01)	$ 7.65