Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Detail Textuals)

v3.10.0.1
Summary of Significant Accounting Policies (Detail Textuals)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Berth
shares
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2018
USD ($)
Berth
shares
Jun. 30, 2017
USD ($)
shares
Jan. 01, 2018
USD ($)
Schedule Of Significant Accounting Policies [Line Items]          
Antidilutive securities excluded from computation of earnings per share | shares 5.9 5.2 4.6 6.4  
Deferred costs         $ 51.6
Foreign currency transaction gain (loss) $ 12.7 $ (8.1) $ 10.9 $ (10.8)  
Capacity of ship, berths | Berth 54,400   54,400    
Receivables from customers included in accounts receivable, net $ 18.3   $ 18.3   13.8
Contract with customer liability 1,500.0   $ 1,500.0   $ 1,000.0
Percentage refundable on cancellation     50.00%    
Revenue recognized included in contract liability     $ 1,000.0    
ASU No. 2016-02          
Schedule Of Significant Accounting Policies [Line Items]          
Income tax expense due to reduction of deferred tax liabilities     $ 7.4    
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%    
Costs incurred to obtain customers          
Schedule Of Significant Accounting Policies [Line Items]          
Capitalized contract cost 140.4   $ 140.4    
Costs to fulfill contracts with customers          
Schedule Of Significant Accounting Policies [Line Items]          
Capitalized contract cost $ 28.9   28.9    
Retained Earnings          
Schedule Of Significant Accounting Policies [Line Items]          
Net cumulative effect of the change     $ 19.1    
Norwegian Bliss          
Schedule Of Significant Accounting Policies [Line Items]          
Capacity of ship, berths | Berth 4,000   4,000    
Percentage of capacity to fleet     8.00%    
Minimum          
Schedule Of Significant Accounting Policies [Line Items]          
Final payment period before voyage     120 days    
Maximum          
Schedule Of Significant Accounting Policies [Line Items]          
Final payment period before voyage     180 days    
Revenue          
Schedule Of Significant Accounting Policies [Line Items]          
Concentration risk, benchmark     No other individual country's revenues exceed 10% in any given period.    
Revenue | Minimum          
Schedule Of Significant Accounting Policies [Line Items]          
Percentage of revenue attributable to U.S.- sourced passengers     75.00%    
Revenue | Maximum          
Schedule Of Significant Accounting Policies [Line Items]          
Percentage of revenue attributable to U.S.- sourced passengers     80.00%