Changes in Accumulated Other Comprehensive Loss - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Changes in Accumulated Other Comprehensive Loss
Foreign exchange gain			$ 3,293
Total cruise operating expenses	$ 424,830	$ 680,420	708,317	$ 2,191,239
Other operating
Changes in Accumulated Other Comprehensive Loss
Total cruise operating expenses	167,099	279,465	296,226	703,463
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	34,300	$ 0	34,300
Pullmantur Holdings
Changes in Accumulated Other Comprehensive Loss
Other expense		69,000		69,000
Currency translation adjustment loss		92,600		92,600
Foreign exchange gain		23,600		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		$ 34,300		$ 34,300