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Employee Retirement Plans - Summary of GMSL's Investments Plan (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | $ 170,772 | $ 172,511 | $ 181,877
Present value of liabilities | (192,599) | (197,600) | $ (219,087)
Net pension asset (liability) | (21,827) |  |
Global Marine Systems Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 167,567 | 169,574 |
Global Marine Systems Pension Plan | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 47,623 | 49,535 |
Global Marine Systems Pension Plan | Liability Hedging Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 40,635 | 41,649 |
Global Marine Systems Pension Plan | Hedge Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 47,068 | 44,363 |
Global Marine Systems Pension Plan | Corporate Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 24,492 | 23,193 |
Global Marine Systems Pension Plan | Property |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 7,544 | 9,137 |
Global Marine Systems Pension Plan | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 205 | 1,697 |
Merchant Navy Officers Pension Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 3,204 | 2,937 |
Merchant Navy Officers Pension Fund | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 525 | 660 |
Merchant Navy Officers Pension Fund | Hedge Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 519 | 412 |
Merchant Navy Officers Pension Fund | Corporate Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 519 | 675 |
Marine Services | Global Marine Systems Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 167,567 | 169,574 |
Present value of liabilities | (189,586) | (194,730) |
Net pension asset (liability) | (22,019) | (25,156) |
Marine Services | Global Marine Systems Pension Plan | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 47,623 | 49,535 |
Marine Services | Global Marine Systems Pension Plan | Liability Hedging Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 40,635 | 41,649 |
Marine Services | Global Marine Systems Pension Plan | Hedge Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 47,068 | 44,363 |
Marine Services | Global Marine Systems Pension Plan | Corporate Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 24,492 | 23,193 |
Marine Services | Global Marine Systems Pension Plan | Property |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 7,544 | 9,137 |
Marine Services | Global Marine Systems Pension Plan | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 205 | 1,697 |
Marine Services | Merchant Navy Officers Pension Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 3,205 | 2,937 |
Present value of liabilities | (3,013) | (2,869) |
Net pension asset (liability) | 192 | 68 |
Marine Services | Merchant Navy Officers Pension Fund | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 526 | 660 |
Marine Services | Merchant Navy Officers Pension Fund | Liability Hedging Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 1,641 | 1,190 |
Marine Services | Merchant Navy Officers Pension Fund | Hedge Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | 519 | 412 |
Marine Services | Merchant Navy Officers Pension Fund | Corporate Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total market value of assets | $ 519 | $ 675 |

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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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