Changes in Operations Australia (Details)	3 Months Ended		1 Months Ended	3 Months Ended		12 Months Ended		3 Months Ended		1 Months Ended		3 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Jul. 31, 2012 Arrium Limited [Member] tons	Mar. 31, 2013 Arrium Limited [Member] Narrow Gauge Locomotives And Wagons [Member] USD ($)	Mar. 31, 2013 Arrium Limited [Member] Narrow Gauge Locomotives And Wagons [Member] AUD	Dec. 31, 2012 Arrium Limited [Member] Narrow Gauge Locomotives And Wagons [Member] USD ($)	Dec. 31, 2012 Arrium Limited [Member] Narrow Gauge Locomotives And Wagons [Member] AUD	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	Sep. 30, 2012 Alice Springs Intermodal And Freight Terminal [Member] USD ($)	Sep. 30, 2012 Alice Springs Intermodal And Freight Terminal [Member] AUD	Dec. 31, 2013 Scenario, Forecast [Member] Arrium Limited [Member] Narrow Gauge Locomotives And Wagons [Member] USD ($)	Dec. 31, 2013 Scenario, Forecast [Member] Arrium Limited [Member] Narrow Gauge Locomotives And Wagons [Member] AUD
Tons per year of product shipped			2,700,000
Purchase of property and equipment	$ 37,908,000	$ 50,318,000		$ 12,000,000	11,500,000	$ 54,100,000	52,100,000			$ 9,200,000	9,000,000
Other commitment														10,000,000	9,600,000
Stamp Duty												600,000	500,000
Proceeds from disposition of property and equipment	2,011,000	1,626,000						4,100,000	4,000,000
Gain/(loss) on sale of property and equipment	$ 1,707,000	$ 1,230,000						$ 1,300,000	1,300,000
EPS impact from gain on sale of property and equpment								$ 0.03