Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended			9 Months Ended
	Dec. 31, 2014 item	Dec. 31, 2014 item	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Aug. 06, 2012		Nov. 30, 2012
Summary Of Significant Accounting Policies [Line Items]
Number of vessels	54	54
Minimum percentage of ownership considered for consolidation (in hundredths)		50.00%
Minimum percentage of ownership considered for equity method of accounting for investments (in hundredths)		20.00%
Maximum percentage of ownership considered for equity method of accounting for investments (in hundredths)		50.00%
Annual payments for each vessel		$ 3,100,000	$ 2,800,000	$ 3,100,000
Inventory	9,760,000	9,760,000	11,322,000
Number of vessels held for sale	5
Capitalized interest		120,000	52,000	120,000
Impairment charges		38,213,000
Long term debt instruments	242,888,000	242,888,000	198,229,000
Inventory	9,760,000	9,760,000	11,322,000
Goodwill	2,735,000	2,735,000	2,735,000
Gain on foreign currency transaction		296,000	412,000	10,000
Gain (loss) on Foreign Currency Exchange		(184,000)	5,914,000	5,506,000
Currency exchange rate, percentage	102.53	102.53
Change in liability from effect of the adjustment to the pension funded status		2,100,000
Change in OCI from effect of the adjustment to the pension funded status		2,800,000
Pension plan, underfunded amount	963,000	963,000
Deferred Drydocking Cost [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization period		5 years
Deferred Drydocking Cost [Member] | Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization period		2 years
Molten Sulphur Carrier Vessel [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of vessels	1	1
Multi-Purpose Vessels [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of vessels	2	2
Number of vehicle/ships owned	1	1
Container Vessels [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of vessels	5	5
Number of vehicle/ships owned	2	2
Tanker [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of vessels	2	2
Number of vessels held for sale	1
PCTC [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of vessels	2	2
Number of vehicle/ships owned	4	4
Mini-Bulkers [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of vessels	16	16
Chemical Tankers [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of vessels	2	2
Asphalt Tankers [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of vessels	2	2
Multi-Purpose Heavy Lift Vessel [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of vessels	1	1
ATB Barge And Tug Units [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of vessels held for sale		1
Handysize Bulk Carriers [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of vessels held for sale	3	3
Fair value less cost to sell	48,700,000	48,700,000
Long term debt instruments	41,400,000	41,400,000
Inventory	500,000	500,000
Tug-Barge Unit [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of vessels held for sale	1
Fair value less cost to sell	6,400,000	6,400,000
Frascati Shops, Inc. And Tower, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill						828,000	[1]
United Ocean Services, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Amortization period	12 years				8 years
Goodwill								$ 1,907,000	[2]

[1] Goodwill represents the sum of the consideration transferred and the net liabilities assumed and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. Our above-described goodwill is not amortized nor do we expect it to be deductible for tax purposes. Specifically, the goodwill recorded as part of the acquisition of the Acquired Companies includes the following: the expected synergies and other benefits that we believe will result from combining the operations of the Acquired Companies with our existing Rail-Ferry operations,any intangible assets that do not qualify for separate recognition, including an assembled workforce of the acquired companies, andthe anticipated higher rate of return of the Acquired Companies existing businesses as going concerns compared to the anticipated rate of return if we had acquired all of the net assets separately.

[2] Goodwill represents the fair value of the consideration transferred over the net assets acquired and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized.  Our above-described goodwill is not amortized nor do we expect it to be deductible for tax purposes.  Specifically, the goodwill recorded as part of the acquisition of UOS includes the following:the expected synergies and other benefits that we believe will result from combining the operations of UOS with our existing Jones Act operations,any intangible assets that do not qualify for separate recognition, including an assembled workforce of the acquired companies, andthe anticipated higher rate of return of UOS’s existing businesses as going concerns compared to the anticipated rate of return if we had acquired all of the net assets separately.