Changes in Accumulated Other Comprehensive Loss - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Changes in Accumulated Other Comprehensive Loss
Foreign exchange gain				$ 4,966
Total cruise operating expenses	$ 813,691	$ 308,609		1,522,008	$ 2,499,848
Other operating
Changes in Accumulated Other Comprehensive Loss
Total cruise operating expenses	273,157	127,226		569,383	830,689
Foreign currency translation adjustments | Other operating | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income
Changes in Accumulated Other Comprehensive Loss
Total cruise operating expenses	$ 0	34,697		$ 0	69,044
Pullmantur Holdings
Changes in Accumulated Other Comprehensive Loss
Other expense					69,000
Currency translation adjustment loss					92,600
Foreign exchange gain					$ 23,600
Pullmantur Holdings | Foreign currency translation adjustments | Other operating | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income
Changes in Accumulated Other Comprehensive Loss
Total cruise operating expenses		$ 34,700	$ 34,300