Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Detail Textuals)

v3.10.0.1
Summary of Significant Accounting Policies (Detail Textuals)
$ in Thousands, shares in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
CruiseShip
shares
Dec. 31, 2017
USD ($)
CruiseShip
shares
Dec. 31, 2016
USD ($)
shares
Schedule Of Significant Accounting Policies [Line Items]      
Allowance for doubtful accounts $ 9,600 $ 5,900  
Advertising costs included in prepaid expenses and other assets 800 2,400  
Expenses related to advertising costs $ 327,300 $ 289,100 $ 270,500
Antidilutive securities excluded from computation of earnings per share | shares 4.7 5.6 7.1
Reduction in estimated residual values, percentage 15.00%    
Goodwill $ 1,388,931 $ 1,388,931  
Number of cruises ships | CruiseShip 26    
Ship, carrying value $ 12,119,253 11,040,488  
Foreign currency transaction (gains) losses $ (19,800) 14,200 $ (4,500)
Income tax expense due to reduction of deferred tax liabilities   $ 7,400  
Tax Year 2017      
Schedule Of Significant Accounting Policies [Line Items]      
US corporate income tax rate 35.00%    
Tax Year 2018      
Schedule Of Significant Accounting Policies [Line Items]      
US corporate income tax rate 21.00%    
ASU No. 2016-16      
Schedule Of Significant Accounting Policies [Line Items]      
Cumulative effect adjustment to retained earnings $ 19,100    
Oceania Cruises      
Schedule Of Significant Accounting Policies [Line Items]      
Goodwill 523,000    
Regent Seven Seas      
Schedule Of Significant Accounting Policies [Line Items]      
Goodwill 462,100    
Norwegian Reporting Units      
Schedule Of Significant Accounting Policies [Line Items]      
Goodwill $ 403,800    
Revenue      
Schedule Of Significant Accounting Policies [Line Items]      
Percentage of revenue attributable to U.S.- sourced passengers 77.00% 77.00% 81.00%
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      
Schedule Of Significant Accounting Policies [Line Items]      
Number of cruises ships | CruiseShip 18 17  
Ship, carrying value $ 9,100,000 $ 8,000,000  
Marshall Island Registry      
Schedule Of Significant Accounting Policies [Line Items]      
Number of cruises ships | CruiseShip 7 7  
Ship, carrying value $ 1,900,000 $ 1,900,000  
U.S. Registry      
Schedule Of Significant Accounting Policies [Line Items]      
Number of cruises ships | CruiseShip 1 1  
Ship, carrying value $ 300,000 $ 300,000