Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Other (Details)

v3.20.4
Summary of Significant Accounting Policies - Other (Details)
$ in Thousands, shares in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2020
item
Dec. 31, 2020
USD ($)
item
segment
shares
Dec. 31, 2019
USD ($)
item
shares
Dec. 31, 2018
USD ($)
shares
Schedule Of Significant Accounting Policies [Line Items]        
Allowance for credit losses   $ 35,400 $ 10,600  
Advertising costs included in prepaid expenses and other assets   900 5,900  
Expenses related to advertising costs   $ 216,500 $ 400,600 $ 327,300
Antidilutive securities excluded from computation of earnings per share | shares   80.0 4.0 4.7
Reduction in estimated residual values, percentage   15.00%    
Number of reporting units | item 3      
Impairment of goodwill   $ 1,290,797    
Goodwill   98,134 $ 1,388,931  
Indefinite-lived intangible assets, trade names   500,525 817,525  
Impairment of trade names   $ 317,000    
Number of reportable segments | segment   1    
Number of cruise ships | item   28    
Ship, carrying value   $ 13,411,226 13,135,337  
Paid-in-kind interest   19,349    
Foreign currency transaction (gains) losses   (15,900) $ (7,000) $ 19,800
Regent        
Schedule Of Significant Accounting Policies [Line Items]        
Impairment of goodwill   0    
Norwegian Reporting Units [Member]        
Schedule Of Significant Accounting Policies [Line Items]        
Goodwill   $ 98,100    
Revenue        
Schedule Of Significant Accounting Policies [Line Items]        
Concentration risk, benchmark   No other individual country’s revenues exceeded 10% in any of our last three years. No other individual country’s revenues exceeded 10% in any of our last three years. No other individual country’s revenues exceeded 10% in any of our last three years.
Trade names        
Schedule Of Significant Accounting Policies [Line Items]        
Indefinite-lived intangible assets, trade names   $ 500,500    
Impairment of trade names   $ 0    
BAHAMAS Registry | Ships        
Schedule Of Significant Accounting Policies [Line Items]        
Number of cruise ships | item   19    
Ship, carrying value   $ 9,900,000 $ 10,200,000  
MARSHALL ISLAND Registry | Ships        
Schedule Of Significant Accounting Policies [Line Items]        
Number of cruise ships | item   8 7  
Ship, carrying value   $ 2,400,000 $ 1,900,000  
United States | Revenue | Passenger ticket        
Schedule Of Significant Accounting Policies [Line Items]        
Percentage of revenue attributable to U.S.- sourced passengers   83.00% 81.00% 77.00%
United States Registry | Ships        
Schedule Of Significant Accounting Policies [Line Items]        
Number of cruise ships | item   1 1  
Ship, carrying value   $ 300,000 $ 300,000