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Leases, Schedule of Rent Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property Subject To Or Available for Operating Lease [Line Items]
Rental expense	$ 166,542	$ 165,257	$ 156,016
Other Buildings and Equipment [Member]
Property Subject To Or Available for Operating Lease [Line Items]
Rental expense	9,383	9,146	10,298
Tank Barges [Member] | Marine Equipment [Member]
Property Subject To Or Available for Operating Lease [Line Items]
Rental expense	14,092	19,780	20,841
Towing Vessels [Member] | Marine Equipment [Member]
Property Subject To Or Available for Operating Lease [Line Items]
Rental expense	$ 143,067	$ 136,331	$ 124,877
Minimum [Member] | Tank Barges [Member]
Property Subject To Or Available for Operating Lease [Line Items]
Lease agreements expiring terms	1 year
Minimum [Member] | Towing Vessels [Member]
Property Subject To Or Available for Operating Lease [Line Items]
Lease agreements expiring terms	30 days
Maximum [Member] | Tank Barges [Member]
Property Subject To Or Available for Operating Lease [Line Items]
Lease agreements expiring terms	12 years
Maximum [Member] | Towing Vessels [Member]
Property Subject To Or Available for Operating Lease [Line Items]
Lease agreements expiring terms	5 years

X

- Definition

Refers to lease agreements expiring terms, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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