Acquisitions And Dispositions (Major Equipment Dispositions) (Details)	12 Months Ended
	Dec. 31, 2013 equipment	Dec. 31, 2012 equipment	Dec. 31, 2011 equipment
Offshore Support Vessels Anchor Handling Towing Supply [Member]
Number Of Equipments Delivered	0	0	0
Number of equipments removed from service	0	2	1
Offshore Support Vessels Crew [Member]
Number Of Equipments Delivered	0	0	0
Number of equipments removed from service	5	2	6
Offshore Support Vessels Mini-Supply [Member]
Number Of Equipments Delivered	0	0	0
Number of equipments removed from service	1	0	0
Offshore Support Vessels Mini-Supply [Member] | Excluded from Equipment Disposition Table [Member]
Number of equipments removed from service			1
Offshore Support Vessels Standby Safety [Member]
Number of equipments removed from service	0	1	1
Offshore Support Vessels Supply [Member]
Number Of Equipments Delivered	0	0	0
Number of equipments removed from service	2	2	1
Offshore Support Vessels Towing Supply [Member]
Number of equipments removed from service	0	0	1
Offshore Support Vessels Specialty [Member]
Number Of Equipments Delivered	2	0	0
Number of equipments removed from service	3	0	1
Liftboats [Member]
Number of equipments removed from service	6	0	0
Wind Farm Utility Vessel [Member]
Number Of Equipments Delivered	5	1	0
Number of equipments removed from service	2	0	0
Offshore Support Vessels [Member]
Number Of Equipments Delivered	0	0	0
Number of equipments removed from service	19	7	11
Inland River Dry Cargo And Deck Barges [Member]
Number Of Equipments Delivered	0	3	55
Number of equipments removed from service	16	9	6
Inland River Liquid Tank Barges [Member]
Number Of Equipments Delivered	2	5	2
Number of equipments removed from service	8	1	1
Inland River Towboats [Member]
Number Of Equipments Delivered	1	2	0
Number of equipments removed from service	0	2	1
U S Flag Tankers [Member]
Number of equipments removed from service	0	0	1
R O R O Vessels [Member]
Number Of Equipments Delivered	1	0	0
Number of equipments removed from service	0	1	0
Azimuth Drive Harbor Tugs [Member]
Number Of Equipments Delivered	4	0	1
Number of equipments removed from service	7	3	1
Coventional Drive Harbor Tugs [Member]
Number of equipments removed from service	1	2	1
Harbor Tugs [Member]
Number of equipments removed from service	8	5	2
SeaJon [Member] | U.S. Flag Articulated Tug-Barge [Member] | Excluded from Equipment Disposition Table [Member]
Number of equipments removed from service		1
MexMar [Member] | Offshore Support Vessels Crew [Member] | Excluded from Equipment Disposition Table [Member]
Number of equipments removed from service			4
MexMar [Member] | Offshore Support Vessels [Member]
Number Of Equipments Delivered	1