Changes in Operations Australia (Details)	12 Months Ended			3 Months Ended		1 Months Ended		12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Sep. 30, 2012 Cook [Member] USD ($)	Sep. 30, 2012 Cook [Member] AUD	Jun. 30, 2012 Alice Springs [Member] USD ($)	Jun. 30, 2012 Alice Springs [Member] AUD	Dec. 31, 2013 Arrium Limited [Member] Narrow Gauge Locomotives And Wagons [Member] USD ($)	Dec. 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
Business Acquisition [Line Items]
Purchase of property and equipment	$ 249,318,000	$ 231,694,000	$ 178,668,000			$ 9,200,000	9,000,000	$ 19,900,000	22,300,000	$ 54,100,000	52,100,000
Stamp duty						600,000	500,000
Proceeds from disposition of property and equipment	6,687,000	15,298,000	9,464,000	4,100,000	4,000,000
Gain on sale of assets	$ 4,677,000	$ 11,225,000	$ 5,660,000	$ 1,300,000	1,300,000