Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended												12 Months Ended		3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Offshore Support Vessels [Member] equipment	Dec. 31, 2013 Inland River Dry Cargo Barges [Member] equipment	Dec. 31, 2013 Inland River Liquid Tank Barges [Member] equipment	Dec. 31, 2013 Inland River Towboats [Member] equipment	Dec. 31, 2013 U.S.-flag Product Tankers [Member] equipment	Dec. 31, 2013 Azimuth Drive Harbor Tugs [Member] equipment	Dec. 31, 2013 Other Machinery and Equipment [Member]	Dec. 31, 2013 Subsequent Event [Member]	Dec. 31, 2013 Subsequent Event [Member] U.S. Flag Articulated Tug-Barge [Member] equipment	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2012 Minimum [Member]	Mar. 31, 2013 Minimum [Member] Double Hull Product Tankers [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2012 Maximum [Member]	Mar. 31, 2013 Maximum [Member] Double Hull Product Tankers [Member]	Dec. 31, 2012 Abood Litigation [Member] claim	Dec. 31, 2012 HEPACO Litigation [Member]	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, 2010 Prejean [Member] claim	Dec. 31, 2010 FLSA Actions [Member] claim
Commitments and Contingencies [Line Items]
Unrecorded unconditional purchase obligation	$ 547,000,000			$ 112,700,000	$ 40,200,000	$ 4,700,000	$ 4,700,000	$ 374,100,000		$ 10,600,000	$ 94,100,000
Total unfunded capital commitments	547,000,000			112,700,000	40,200,000	4,700,000	4,700,000	374,100,000		10,600,000	94,100,000
Unrecorded Unconditional Purchase Obligation, Maximum Quantity				16	80	6	5	3				1
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	304,900,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	232,800,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	9,300,000
Loss Contingency, New Claims Filed, Number																			174		2	1	10	410	117	668	330	3
Loss Contingency, Damages Sought, Value																				20,291,178.92
Number of equipment leases				22	10			2	9
Sale Leaseback Transaction, Lease Terms			84										60	48	105	120	96	121
Total rental expense for operating leases	$ 70,900,000	$ 57,900,000	$ 44,200,000