Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Textuals) (Details)

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Summary of Significant Accounting Policies (Textuals) (Details)
$ in Thousands, shares in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
segment
item
shares
Dec. 31, 2018
USD ($)
item
shares
Dec. 31, 2017
USD ($)
shares
Schedule Of Significant Accounting Policies [Line Items]      
Allowance for doubtful accounts $ 10,600 $ 9,600  
Advertising costs included in prepaid expenses and other assets   800  
Expenses related to advertising costs $ 400,600 $ 327,300 $ 289,100
Antidilutive securities excluded from computation of earnings per share | shares 4.0 4.7 5.6
Reduction in estimated residual values, percentage 15.00%    
Number of reporting units | item 3    
Goodwill $ 1,388,931 $ 1,388,931  
Impairment of goodwill 0    
Impairment of tradenames $ 0    
Number of reportable segments | segment 1    
Number of cruises ships | item 27    
Ship, carrying value $ 13,135,337 12,119,253  
Foreign currency transaction (gains) losses $ 7,000 $ 19,800 $ 14,200
Income tax expense due to reduction of deferred tax liabilities     $ 7,400
Tax Year 2017      
Schedule Of Significant Accounting Policies [Line Items]      
U.S. corporate income tax rate     35.00%
Tax Year 2018      
Schedule Of Significant Accounting Policies [Line Items]      
U.S. corporate income tax rate 21.00%    
Oceania Cruises      
Schedule Of Significant Accounting Policies [Line Items]      
Goodwill $ 523,000    
Regent      
Schedule Of Significant Accounting Policies [Line Items]      
Goodwill 462,100    
Norwegian Reporting Units [Member]      
Schedule Of Significant Accounting Policies [Line Items]      
Goodwill $ 403,800    
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.
BAHAMAS Registry | Ships      
Schedule Of Significant Accounting Policies [Line Items]      
Number of cruises ships | item 19 18  
Ship, carrying value $ 10,200,000 $ 9,100,000  
MARSHALL ISLAND Registry | Ships      
Schedule Of Significant Accounting Policies [Line Items]      
Number of cruises ships | item 7 7  
Ship, carrying value $ 1,900,000    
United States | Revenue | Passenger ticket      
Schedule Of Significant Accounting Policies [Line Items]      
Percentage of revenue attributable to U.S.- sourced passengers 81.00% 77.00% 77.00%
United States Registry | Ships      
Schedule Of Significant Accounting Policies [Line Items]      
Number of cruises ships | item 1 1  
Ship, carrying value $ 300,000 $ 300,000