Commitments And Contingencies (Narrative) (Details) (USD $)		12 Months Ended															9 Months Ended
	Sep. 30, 2014	Dec. 31, 2010 Wunstell Action [Member] plaintiff	Dec. 31, 2010 Master Complaints [Member] plaintiff	Dec. 31, 2011 Multi-district Litigation [Member]	Dec. 31, 2012 Darnell Alexander [Member] claim	Dec. 31, 2011 Darnell Alexander [Member] claim	Dec. 31, 2012 Abney Litigation [Member] claim	Dec. 31, 2012 Abood Litigation [Member] claim	Dec. 31, 2013 HEPACO Litigation [Member]	Dec. 31, 2010 Prejean [Member] claim	Sep. 30, 2014 Offshore Support Vessels [Member] equipment	Sep. 30, 2014 Inland River Liquid Tank Barges [Member] equipment	Sep. 30, 2014 Inland River Towboats [Member] equipment	Sep. 30, 2014 U.S.-flag Product Tankers [Member] equipment	Sep. 30, 2014 U.S. Flag Articulated Tug-Barge [Member] equipment	Sep. 30, 2014 Other Machinery and Equipment [Member]	Sep. 30, 2014 Offshore Marine Services [Member]
Loss Contingencies [Line Items]
Total unfunded capital commitments	$ 520,500,000										$ 201,600,000	$ 1,300,000	$ 3,300,000	$ 230,200,000	$ 71,300,000	$ 12,800,000
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	48,000,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	426,000,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	46,500,000
Unrecorded Unconditional Purchase Obligation, Maximum Quantity											18	2	4	3	1
Claims Filed		2	1	10	410	117	668	174		330
Loss Contingency, Damages Sought, Value									20,291,178.92
Other Nonoperating Gains (Losses)																	$ 14,700,000