Annual report pursuant to Section 13 and 15(d)

Employee Benefits and Share-Based Compensation - (Detail Textuals)

v3.8.0.1
Employee Benefits and Share-Based Compensation - (Detail Textuals) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
May 31, 2016
Jan. 31, 2013
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 30, 2014
Defined Benefit Plan Disclosure [Line Items]            
Intrinsic value of units exchanged     $ 39,115      
Share-based compensation expense     87,039 $ 66,414 $ 42,209  
Forfeited contributions utilized     300 100 400  
Recorded expenses related to 401k plan and SERP     $ 7,300 $ 6,400 $ 5,300  
Discount rate used in the net periodic benefit cost calculation     4.00% 4.30% 3.80%  
Amortization period of losses     18 years 10 months 6 days      
Total taxes paid pursuant to net share settlements in 2017     $ 6,342      
Retained Earnings            
Defined Benefit Plan Disclosure [Line Items]            
Net cumulative effect of the change     $ 2,200      
Performance Incentive Plan            
Defined Benefit Plan Disclosure [Line Items]            
Share options and ordinary shares, authorized   15,035,106        
Maximum number of shares that can be granted to one individual   5,000,000        
Employee Stock Purchase Plan            
Defined Benefit Plan Disclosure [Line Items]            
Number of shares authorized to repurchase           2,000,000
Percentage of purchase price discount     15.00%      
Accrued payroll liability     $ 1,500 $ 1,300    
Restated 2013 Plan            
Defined Benefit Plan Disclosure [Line Items]            
Share options and ordinary shares, authorized 27,465,106          
Number of additional shares authorized 12,430,000          
401(k) Plan            
Defined Benefit Plan Disclosure [Line Items]            
Maximum percentage of employee eligible compensation that may be contributed towards 401(k)     100.00%      
Defined contribution plan, percentage of employee contribution     3.00%      
Matching contributions vesting period     5 years      
401(k) Plan | The first 3%            
Defined Benefit Plan Disclosure [Line Items]            
Employer matching contribution percent     100.00%      
401(k) Plan | Amounts greater than 3%            
Defined Benefit Plan Disclosure [Line Items]            
Employer matching contribution percent     50.00%      
401(k) Plan | Amounts greater than 3% | Minimum            
Defined Benefit Plan Disclosure [Line Items]            
Employer matching contribution percent     10.00%      
Supplemental Executive Retirement Plan (SERP)            
Defined Benefit Plan Disclosure [Line Items]            
Participants' deferred compensation accounts under the SERP Plan       500    
Shipboard Retirement Plan            
Defined Benefit Plan Disclosure [Line Items]            
Projected benefit obligation included in accrued expenses and other liabilities     $ 1,100 1,200    
Projected benefit obligation included in other long term liabilities     23,500 21,400    
Options            
Defined Benefit Plan Disclosure [Line Items]            
Total intrinsic value of stock options exercised     18,900 5,200 $ 68,000  
Proceeds from the exercise of share options     $ 27,400 $ 7,600 $ 69,100  
Time Based Options            
Defined Benefit Plan Disclosure [Line Items]            
Share options granted     0      
Exercise price of share options granted     $ 0      
Weighted average period for recognition of unrecognized compensation expense     10 months 24 days      
Weighted-average grant-date fair value of options granted       $ 17.11 $ 20.90  
Total unrecognized compensation cost related to share options granted     $ 27,600      
Time Based Options | Restated 2013 Plan            
Defined Benefit Plan Disclosure [Line Items]            
Description of share-based awards vesting period The vesting period for time-based options is typically set at 3, 4 or 5 years          
Time Based Options | Restated 2013 Plan | Minimum            
Defined Benefit Plan Disclosure [Line Items]            
Share based award, contractual life 7 years          
Time Based Options | Restated 2013 Plan | Maximum            
Defined Benefit Plan Disclosure [Line Items]            
Share based award, contractual life 10 years          
Performance Based Options            
Defined Benefit Plan Disclosure [Line Items]            
Share options granted     156,249      
Exercise price of share options granted     $ 59.43      
Weighted average period for recognition of unrecognized compensation expense     0 years      
Weighted-average grant-date fair value of options granted     $ 8.55 $ 8.67 17.07  
Total unrecognized compensation cost related to share options granted     $ 0      
Share awards granted     37,500      
Performance Based Options | Amendment to employment agreement            
Defined Benefit Plan Disclosure [Line Items]            
Share options granted     208,335      
Market Based Share Option Awards            
Defined Benefit Plan Disclosure [Line Items]            
Share options granted     0      
Exercise price of share options granted     $ 0      
Weighted average period for recognition of unrecognized compensation expense     0 years      
Weighted-average grant-date fair value of options granted         $ 12.37  
Total unrecognized compensation cost related to share options granted     $ 0      
Restricted Stock            
Defined Benefit Plan Disclosure [Line Items]            
Unrecognized compensation expense     $ 25      
Weighted average period for recognition of unrecognized compensation expense     1 year      
Total fair value of shares vested     $ 100 $ 1,100 $ 40,900  
Description of share-based awards vesting period     equal quarterly installments over 1 or 2 years or in annual installments over 4 years      
"Time-Based Units" ("TBUs")            
Defined Benefit Plan Disclosure [Line Items]            
Unrecognized compensation expense     $ 89,100      
Weighted average period for recognition of unrecognized compensation expense     1 year 10 months 24 days      
Share awards granted     1,803,327      
"Time-Based Units" ("TBUs") | Employee | Awarded on March 1, 2017            
Defined Benefit Plan Disclosure [Line Items]            
Share based award, vesting period     3 years      
Restricted share unit awards granted     1,700,000      
"Time-Based Units" ("TBUs") | Restated 2013 Plan            
Defined Benefit Plan Disclosure [Line Items]            
Share based award, vesting period 3 years          
"Performance-Based Units" ("PBUs")            
Defined Benefit Plan Disclosure [Line Items]            
Unrecognized compensation expense     $ 0      
Weighted average period for recognition of unrecognized compensation expense     0 years      
"Performance-Based Units" ("PBUs") | President and Chief Executive Officer | Awarded on August 1, 2017            
Defined Benefit Plan Disclosure [Line Items]            
Restricted share unit awards granted     79,073      
"Performance-Based Units" ("PBUs") | Management | Awarded on March 1, 2017            
Defined Benefit Plan Disclosure [Line Items]            
Restricted share unit awards granted     121,000      
"Performance-Based Units" ("PBUs") | Amendment to employment agreement            
Defined Benefit Plan Disclosure [Line Items]            
Share awards granted     329,146      
Market-based RSUs            
Defined Benefit Plan Disclosure [Line Items]            
Unrecognized compensation expense     $ 0      
Weighted average period for recognition of unrecognized compensation expense     0 years      
Share awards granted     0      
Restricted Share Units ("RSUs")            
Defined Benefit Plan Disclosure [Line Items]            
Total taxes paid pursuant to net share settlements in 2017     $ 6,300