Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net Income attributable to Royal Caribbean Cruises Ltd. for basic and diluted earnings per share	$ 472,830	$ 466,295	$ 722,511	$ 684,948
Weighted-average common shares outstanding (in shares)	209,531,000	211,673,000	209,427,000	212,139,000
Dilutive effect of stock-based awards and stock options (in shares)	521,000	836,000	535,000	940,000
Diluted weighted-average shares outstanding (in shares)	210,052,000	212,509,000	209,962,000	213,079,000
Basic earnings per share (in dollars per share)	$ 2.26	$ 2.20	$ 3.45	$ 3.23
Diluted earnings per share (in dollars per share)	$ 2.25	$ 2.19	$ 3.44	$ 3.21
Antidilutive securities (in shares)	0	0	0	0