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Employee Retirement Plans - Global Marine Systems Pension Plan - Defined Benefits Section Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined benefit, maximum employees contributions percentage 6.00%      
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  
Global Marine Systems Pension Plan—Defined Benefit Section        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined benefit, maximum employees contributions percentage 5.00%      
Defined benefit, minimum employees contributions percentage 8.00%      
Percentage of pensionable salaries 9.20%      
Defined benefit, employer deficit contributions per year $ 1,400      
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 $ 146,700     $ 2,800
Percentage of market value of defined benefit plan assets 74.00%     0.08%
Contributions payable every month during year 2015 to 2018 $ 500      
Contributions payable every month during year 2019 to May 2021 600      
Contributions payable in June 2021 $ 100      
Percentage of profits after tax before dividends 10.00%      
Payment of profits, period 2 years      
Percentage of future dividend payable in cash 50.00%