General - Narrative (Details)	Mar. 31, 2018 brand
Schedule of Equity Method Investments [Line Items]
Number of cruise brands	3
Maximum
Schedule of Equity Method Investments [Line Items]
Investment in a joint venture, percentage of interest	50.00%
Minimum
Schedule of Equity Method Investments [Line Items]
Investment in a joint venture, percentage of interest	20.00%
TUI Cruises
Schedule of Equity Method Investments [Line Items]
Investment in a joint venture, percentage of interest	50.00%
Pullmantur and CDF Croisieres de France
Schedule of Equity Method Investments [Line Items]
Investment in a joint venture, percentage of interest	49.00%
SkySea Cruises [Member]
Schedule of Equity Method Investments [Line Items]
Investment in a joint venture, percentage of interest	36.00%