Impairment Loss (Details) $ in Thousands		1 Months Ended	3 Months Ended					12 Months Ended
		Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($) item	Dec. 31, 2014 USD ($)		Dec. 31, 2015 USD ($) item		Dec. 31, 2014 USD ($) item
Property, Plant and Equipment [Line Items]
Goodwill impairment loss			$ 800					$ (2,735)
Short term assets held for sale			51,846			$ 6,976		51,846		$ 6,976
Impairment charges of assets held for sale								(154,463)		$ (38,213)
Impairment Losses, Intangible Assets, net			400
TECO [Member]
Property, Plant and Equipment [Line Items]
Extend contract of affreightment agreement term						3 years
Extend contract of affreightment agreement renewal option period						2 years
Frascati Shops, Inc. and Tower, LLC [Member]
Property, Plant and Equipment [Line Items]
Goodwill impairment loss			800					828	[1]
Impairment charges of assets held for sale								94,300
Impairment Losses, Intangible Assets, net	[2]							(411)
United Ocean Services, LLC [Member]
Property, Plant and Equipment [Line Items]
Goodwill impairment loss								1,900
Impairment Losses, Intangible Assets, net			22,100					$ (22,129)	[3]
Jones Act [Member]
Property, Plant and Equipment [Line Items]
Number of vessels held for sale | item								1
Jones Act [Member] | United Ocean Services, LLC [Member]
Property, Plant and Equipment [Line Items]
Goodwill impairment loss		$ 1,900						$ 1,907	[4]
Tanker [Member]
Property, Plant and Equipment [Line Items]
Number of vessels held for sale | item										1
Tanker [Member] | Specialty Contracts [Member]
Property, Plant and Equipment [Line Items]
Impairment charges of assets held for sale						$ 3,300
Fair value of asset held for sell						1,500				$ 1,500
Total original carrying value prior to impairment						4,800				4,800
Handysize Bulk Carriers [Member] | Dry Bulk Carriers [Member]
Property, Plant and Equipment [Line Items]
Impairment charges of assets held for sale						28,300
Fair value of asset held for sell						49,200				49,200
Total original carrying value prior to impairment						77,500				$ 77,500
Tug-Barge Unit [Member]
Property, Plant and Equipment [Line Items]
Number of vessels held for sale | item										1
Tug-Barge Unit [Member] | Jones Act [Member]
Property, Plant and Equipment [Line Items]
Impairment charges of assets held for sale				$ 1,100		6,600
Fair value of asset held for sell						6,400				$ 6,400
Total original carrying value prior to impairment						13,000				$ 13,000
Handysize Vessel [Member]
Property, Plant and Equipment [Line Items]
Number of vessels held for sale | item								2		3
Impairment charges of assets held for sale			(3,300)							$ 31,629	[5]
Fair value of asset held for sell			28,300			$ 48,701	[5]	$ 28,300		48,701	[5]
Handysize Vessel [Member] | Dry Bulk Carriers [Member]
Property, Plant and Equipment [Line Items]
Number Of vessels placed into sevice from assets held for sale | item					2
Impairment charges of assets held for sale					$ 1,800
Tanker, Handysize And Inactive Tug/Barge Unit [Member]
Property, Plant and Equipment [Line Items]
Impairment charges of assets held for sale										$ 38,200
Ice Strengthened Multi-Purpose Vessel [Member] | Specialty Contracts [Member]
Property, Plant and Equipment [Line Items]
Impairment charges of assets held for sale			$ 10,500

[1] Refers to the goodwill associated with our FSI acquisition, which is held for sale.

[2] Refers to trade names and customer relations associated with our FSI acquisition, which is held for sale

[3] Refers to trade names and customer relations associated with our UOS acquisition included in the Jones Act segment.

[4] Refers to the goodwill associated with our UOS acquisition included in the Jones Act segment.

[5] The loss of $31.6 million includes the loss related to three handysize vessels of approximately $28.3 million and a tanker of approximately $3.3 million that were written down to their fair market value less costs to sell. The tanker was sold during the fourth quarter of 2014. The assets held for sale balance of $48.7 million represents the three handysize vessels and their related equipment.