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Employee Retirement Plans - Merchant Navy Officers Pension Fund Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 01, 2013
Mar. 31, 2012
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Actuarial valuation assumption used, increase in return on investment per year (as a percent)       4.55%  
Market value of defined benefit plan assets     $ 170,772 $ 172,511 $ 181,877
Merchant Navy Officers Pension Fund          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Actuarial valuation assumption used, retail price Inflation rate per year (as a percent)     3.10%    
Actuarial valuation assumption used, consumer price Inflation rate per year (as a percent)     2.10%    
Actuarial valuation assumption used, pre-retirement return on investment per year (as a percent)     4.75%    
Actuarial valuation assumption used, post-retirement return on investment per year (as a percent)     2.60%    
Expected rate of pensions increase per year (as a percent)     2.90%    
Market value of defined benefit plan assets   $ 3,600,000      
Global Marine Systems Pension Plan—Defined Benefit Section          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Actuarial valuation assumption used, retail price Inflation rate per year (as a percent)     3.70%    
Actuarial valuation assumption used, consumer price Inflation rate per year (as a percent)     2.70%    
Actuarial valuation assumption used, pre-retirement return on investment per year (as a percent)     5.50%    
Actuarial valuation assumption used, post-retirement return on investment per year (as a percent)     4.50%    
Actuarial valuation assumption used, increase in return on investment per year (as a percent)     3.00%    
Market value of defined benefit plan assets   $ 2,800 $ 146,700    
Percentage of market value of defined benefit plan assets   0.08% 74.00%    
Deficit contributions receivable amount   $ 394,000      
Percentage of accrued service and projected salaries   99.70%      
Percentage of pensionable salaries 20.00%