(Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net (Loss) attributable to Royal Caribbean Cruises Ltd. for basic and diluted loss per share	$ (1,131,722)	$ (1,444,479)
Weighted-average common shares outstanding (in shares)	243,004	209,097
Diluted weighted-average shares outstanding (in shares)	243,004	209,097
Basic (loss) per share (in dollars per share)	$ (4.66)	$ (6.91)
Diluted (loss) per share (in dollars per share)	$ (4.66)	$ (6.91)
Antidilutive securities (in shares)	413,501	877