Business and Customers (Details)	12 Months Ended
	Dec. 31, 2013 customer region mile port railroad employee	Dec. 31, 2012	Dec. 31, 2011
Entity Information [Line Items]
Track miles	14,700
Number of railroads operated	111
Number of operating regions	11
Number of employees	4,800
customers served	2,000
Ports operated	35
Percent of revenues from 10 largest customers	24.00%	31.00%	29.00%
GWA North [Member]
Entity Information [Line Items]
Track miles	1,400