Earnings Per Common Share Series A-1 Preferred Stock (Details) (The Carlyle Group [Member], USD $)			3 Months Ended
	Jul. 23, 2012 RailAmerica [Member]	Jul. 17, 2012 RailAmerica [Member]	Mar. 31, 2013 Series A-1 Preferred Stock [Member]	Feb. 13, 2013 Series A-1 Preferred Stock [Member]	Oct. 02, 2012 Series A-1 Preferred Stock [Member] RailAmerica [Member]	Jul. 17, 2012 Series A-1 Preferred Stock [Member] RailAmerica [Member]
Series A-1 Preferred Stock shares issued					350,000
Stated amount per share					$ 1,000.00
Net proceeds from issuance of Series A-1 Preferred Stock					$ 349,400,000
Stock Issued During Period, Shares, Conversion of Convertible Securities			5,984,232
Convertible preferred stock coupon rate						5.00%
Preferred Stock conversion shares	17.1
Optional Preferred Stock Conversion Rate	130.00%
Optional Preferred Stock Conversion Price	$ 76.03
Preferred Stock conversion price		58.49
Premium on conversion price						4.50%
Cash paid with conversion of preferred stock				$ 2,100,000