Annual report pursuant to Section 13 and 15(d)

Long-Term Debt - Summary of Long-term debt (Parentheticals) (Details)

v3.8.0.1
Long-Term Debt - Summary of Long-term debt (Parentheticals) (Details)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
$875.0 million senior secured revolving credit facility        
Debt Instrument [Line Items]        
Debt, principal amount | $ $ 875.0      
$750.0 million senior secured revolving credit facility        
Debt Instrument [Line Items]        
Debt, principal amount | $   $ 750.0    
$1,506.6 million term loan A facility        
Debt Instrument [Line Items]        
Debt, principal amount | $   1,506.6    
$375.0 million Term Loan B        
Debt Instrument [Line Items]        
Debt, principal amount | $ 375.0      
Original issue discount | $ 0.9      
$700.0 million 4.750% senior unsecured notes        
Debt Instrument [Line Items]        
Debt, principal amount | $ $ 700.0 700.0    
Interest rate 4.75%      
$600.0 million 4.625% senior unsecured notes        
Debt Instrument [Line Items]        
Debt, principal amount | $   $ 600.0    
Interest rate   4.625%    
Norwegian Epic term loan        
Debt Instrument [Line Items]        
Debt, principal amount     € 662.9 € 662.9
Pride of Hawaii Loan        
Debt Instrument [Line Items]        
Debt, principal amount     308.1 308.1
Norwegian Jewel term loan        
Debt Instrument [Line Items]        
Debt, principal amount | $   $ 334.1    
Pride of America Hermes Loan        
Debt Instrument [Line Items]        
Debt, principal amount       258.0
Breakaway one loan        
Debt Instrument [Line Items]        
Debt, principal amount     529.8 529.8
Breakaway two loan        
Debt Instrument [Line Items]        
Debt, principal amount     529.8 529.8
Breakaway three loan        
Debt Instrument [Line Items]        
Debt, principal amount     590.5 590.5
Breakaway four loan        
Debt Instrument [Line Items]        
Debt, principal amount     729.9 729.9
Norwegian Jewel term loan one        
Debt Instrument [Line Items]        
Debt, principal amount       126.0
Norwegian Jade term loan        
Debt Instrument [Line Items]        
Debt, principal amount       126.0
Seahawk 1 term loan        
Debt Instrument [Line Items]        
Debt, principal amount     666.0 666.0
Seahawk 2 term loan        
Debt Instrument [Line Items]        
Debt, principal amount     € 666.0 € 666.0
Marina newbuild loan        
Debt Instrument [Line Items]        
Net unamortized premium | $ $ 0.2 0.2    
Riviera newbuild loan        
Debt Instrument [Line Items]        
Net unamortized premium | $ $ 0.2 $ 0.3