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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%

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Defined contribution plan assumptions used calculating benefit obligation pre retirement rate of return on investments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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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.

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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

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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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