Refers to the amount of accruals for revenues earned included in accounts receivable.

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Refers to the accumulated amount of amortization of goodwill.

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Amount of amortization expense attributable to major maintenance activity costs.

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Represents the period in which recertification of ocean going vessels occur twice.

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Represents the period of amortization of shipyard costs.

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No definition available.

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Refers to the amount of receivables from insurance companies to cover claims in excess included in accounts receivable.

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No definition available.

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Amount of reclassification of debt issuance cost from other assets to long term debt, less current portion.

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No definition available.

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Refers to the period of revenue derived form the term contracts maturity.

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No definition available.

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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No definition available.

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of interest capitalized during the period.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Summary of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts Receivable [Abstract]
Accruals for revenues earned included in accounts receivable	$ 84,453,000	$ 90,166,000
Receivables from insurance companies to cover claims in excess included in accounts receivable	$ 88,182,000	77,684,000
Drydocking on Ocean-Going Vessels [Abstract]
Period in which recertification of ocean going vessels occur twice	5 years
Recognized amortization of major maintenance costs	$ 19,869,000	22,126,000	$ 16,409,000
Capitalized interest excluded from interest expense	2,974,000	3,026,000	639,000
Goodwill [Abstract]
Impairment of goodwill	0	0
Gross carrying value of goodwill	615,598,000	604,185,000
Accumulated amortization	15,566,000	15,566,000
Accumulated impairment losses	1,901,000	1,901,000
Net goodwill	598,131,000	586,718,000
Accrued Insurance [Abstract]
Accrued insurance liabilities	$ 23,085,000	23,737,000	$ 25,416,000
Minimum [Member]
Drydocking on Ocean-Going Vessels [Abstract]
Period of amortization of shipyard costs	30 months
Maximum [Member]
Drydocking on Ocean-Going Vessels [Abstract]
Period of amortization of shipyard costs	60 months
Marine Transportation Equipment [Member] \| Minimum [Member]
Property, Maintenance and Repairs [Abstract]
Estimated useful lives of the individual assets	5 years
Marine Transportation Equipment [Member] \| Maximum [Member]
Property, Maintenance and Repairs [Abstract]
Estimated useful lives of the individual assets	40 years
Buildings [Member] \| Minimum [Member]
Property, Maintenance and Repairs [Abstract]
Estimated useful lives of the individual assets	10 years
Buildings [Member] \| Maximum [Member]
Property, Maintenance and Repairs [Abstract]
Estimated useful lives of the individual assets	40 years
Other Equipment [Member] \| Minimum [Member]
Property, Maintenance and Repairs [Abstract]
Estimated useful lives of the individual assets	2 years
Other Equipment [Member] \| Maximum [Member]
Property, Maintenance and Repairs [Abstract]
Estimated useful lives of the individual assets	10 years
Marine Transportation Segment [Member]
Goodwill [Abstract]
Net goodwill	$ 382,227,000	381,243,000
Marine Transportation Segment [Member] \| Minimum [Member]
Revenue Recognition [Abstract]
Range of term contracts	1 year
Marine Transportation Segment [Member] \| Maximum [Member]
Revenue Recognition [Abstract]
Range of term contracts	3 years
Diesel Engine Services Segment [Member]
Goodwill [Abstract]
Net goodwill	$ 215,904,000	$ 205,475,000
ASU 2015-03 [Member]
Accounting Standards [Abstract]
Reclassification of debt issuance cost from other assets to long term debt, less current portion	$ 3,985,000