Changes in Operations Australia (Details)	3 Months Ended		9 Months Ended		3 Months Ended		1 Months Ended		12 Months Ended	9 Months Ended		12 Months Ended		3 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2012 Cook [Member] USD ($)	Sep. 30, 2012 Cook [Member] AUD	Jun. 30, 2012 Alice Springs intermodal and freight terminal [Member] USD ($)	Jun. 30, 2012 Alice Springs intermodal and freight terminal [Member] AUD	Dec. 31, 2013 Arrium Limited [Member] Scenario, Forecast [Member] tons	Sep. 30, 2013 Arrium Limited [Member] Narrow gauge locomotives and rail cars [Member] USD ($)	Sep. 30, 2013 Arrium Limited [Member] Narrow gauge locomotives and rail cars [Member] AUD	Dec. 31, 2012 Arrium Limited [Member] Narrow gauge locomotives and rail cars [Member] USD ($)	Dec. 31, 2012 Arrium Limited [Member] Narrow gauge locomotives and rail cars [Member] AUD	Dec. 31, 2013 Arrium Limited [Member] Narrow gauge locomotives and rail cars [Member] Scenario, Forecast [Member] USD ($)	Dec. 31, 2013 Arrium Limited [Member] Narrow gauge locomotives and rail cars [Member] Scenario, Forecast [Member] AUD
Additional tons per year expected to ship									2,700,000
Purchase of property and equipment			$ 170,435,000	$ 170,529,000			$ 9,200,000	9,000,000		$ 18,200,000	19,500,000	$ 54,100,000	52,100,000	$ 2,400,000	2,600,000
Tax liability for stamp duty							600,000	500,000
Proceeds from disposition of property and equipment			3,954,000	13,673,000	4,100,000	4,000,000
Gain/(loss) on sale of property and equipment	$ 703,000	$ 3,018,000	$ 3,419,000	$ 10,447,000	$ 1,300,000	1,300,000
EPS impact from gain on sale of property and equipment					$ 0.03