Equity Investment RailAmerica Condensed Consolidated Statement of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended				3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 28, 2012 RailAmerica [Member]	Oct. 02, 2012 RailAmerica [Member]
Net cash provided by operating activities	$ 413,504	$ 170,679	$ 173,469		$ 41,897
Net cash used in investing activities	(208,718)	(2,101,690)	(235,128)		(19,804)
Net cash used in financing activities	(205,942)	1,963,491	62,035		(144)
Effect of exchange rate changes on cash and cash equivalents	(740)	5,023	(524)		(129)
Increase in cash and cash equivalents	(1,896)	37,503	(148)		21,820
Cash and cash equivalents	$ 62,876	$ 64,772	$ 27,269	$ 27,417	$ 107,922	$ 86,102