Annual report [Section 13 and 15(d), not S-K Item 405]

Employee Benefits and Share-Based Compensation - (Details)

v3.25.0.1
Employee Benefits and Share-Based Compensation - (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jan. 31, 2013
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Maximum percentage of employee eligible compensation that may be contributed towards 401(k) Plan     100.00%      
Matching contributions vesting period     5 years      
Recorded expenses related to 401(k) plan     $ 13.3 $ 0.6 $ 11.6  
Discount rate used in the net periodic benefit cost calculation     5.00% 5.30% 2.80%  
Average future period of service     16 years      
First Three Percent Of Contributions On Defined Contribution Plan            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Defined contribution plan, percentage of employee contribution         3.00%  
Employer matching contribution percent         100.00%  
Amounts Greater Than Three Percent [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Employer matching contribution percent         50.00%  
Amounts Greater Than Three Percent [Member] | Minimum            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Defined contribution plan, percentage of employee contribution         3.00%  
Amounts Greater Than Three Percent [Member] | Maximum            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Defined contribution plan, percentage of employee contribution         10.00%  
Shipboard Retirement Plan            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Plan assets     $ 0.0      
Projected benefit obligation included in accrued expenses and other liabilities     1.7 $ 1.5    
Projected benefit obligation included in other long-term liabilities     29.5 $ 32.9    
Employee Stock Option [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Total unrecognized compensation cost related to share options granted     $ 0.0      
Time-Based Awards            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share awards granted     4,673,132      
Total unrecognized compensation cost related to restricted share unit awards     $ 94.8      
Weighted-average period for recognition of unrecognized compensation expense     1 year 9 months 18 days      
Time-Based Awards | Awarded in March 2023 | Employee            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share awards granted   4,500,000        
Share-based award, vesting period   3 years        
Performance-Based RSU Awards            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share awards granted     945,040      
Total unrecognized compensation cost related to restricted share unit awards     $ 19.9      
Performance-Based RSU Awards | Awarded in March 2023 | Members of management team            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share awards granted   900,000        
Restated 2013 Plan | Maximum            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
NCLH ordinary shares authorized           42,009,006
Restated 2013 Plan, Amended            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
NCLH ordinary shares authorized 45,009,006          
Number of additional shares authorized 3,000,000          
Restated 2013 Plan, Amended | Time-Based Options            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Description of share-based awards vesting period The vesting period for time-based options is typically set at three or four years with a contractual life of 10 years          
Restated 2013 Plan, Amended | Time-Based Options | Maximum            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based award, contractual life 10 years          
Restated 2013 Plan, Amended | Time-Based Options | Option Vesting Period, Three Years | Employee            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based award, vesting period 3 years          
Restated 2013 Plan, Amended | Time-Based Options | Option Vesting Period, Four Years | Employee            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based award, vesting period 4 years          
Restated 2013 Plan, Amended | Restricted Stock Units (RSUs) [Member]            
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]            
Share-based award, vesting period 3 years