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Employee Retirement Plans - Summary of Fair Value of Pension Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets $ 170,772 $ 172,511 $ 181,877
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 3,204 2,937 $ 3,104
Global Marine Systems Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 167,567 169,574  
Global Marine Systems Pension Plan | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 47,623 49,535  
Global Marine Systems Pension Plan | Liability Hedging Assets      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 40,635 41,649  
Global Marine Systems Pension Plan | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 47,068 44,363  
Global Marine Systems Pension Plan | Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 24,492 23,193  
Global Marine Systems Pension Plan | Property      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 7,544 9,137  
Global Marine Systems Pension Plan | Other      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 205 1,697  
Global Marine Systems Pension Plan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets (37) 1,697  
Global Marine Systems Pension Plan | Level 1 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0 0  
Global Marine Systems Pension Plan | Level 1 | Liability Hedging Assets      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0 0  
Global Marine Systems Pension Plan | Level 1 | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0 0  
Global Marine Systems Pension Plan | Level 1 | Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0 0  
Global Marine Systems Pension Plan | Level 1 | Property      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 0 0  
Global Marine Systems Pension Plan | Level 1 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets (37) 1,697  
Global Marine Systems Pension Plan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 167,604 167,877  
Global Marine Systems Pension Plan | Level 2 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 47,623 49,535  
Global Marine Systems Pension Plan | Level 2 | Liability Hedging Assets      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 40,635 41,649  
Global Marine Systems Pension Plan | Level 2 | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 47,068 44,363  
Global Marine Systems Pension Plan | Level 2 | Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 24,492 23,193  
Global Marine Systems Pension Plan | Level 2 | Property      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 7,544 9,137  
Global Marine Systems Pension Plan | Level 2 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 242 0  
Merchant Navy Officers Pension Fund      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 3,204 2,937  
Merchant Navy Officers Pension Fund | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 525 660  
Merchant Navy Officers Pension Fund | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 519 412  
Merchant Navy Officers Pension Fund | Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 519 675  
Merchant Navy Officers Pension Fund | LDI Strategy      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 1,641 1,190  
Merchant Navy Officers Pension Fund | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 3,204 2,937  
Merchant Navy Officers Pension Fund | Level 3 | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 525 660  
Merchant Navy Officers Pension Fund | Level 3 | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 519 412  
Merchant Navy Officers Pension Fund | Level 3 | Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets 519 675  
Merchant Navy Officers Pension Fund | Level 3 | LDI Strategy      
Defined Benefit Plan Disclosure [Line Items]      
Total Plan Net Assets $ 1,641 $ 1,190