Changes in Operations Australia (Details) $ in Thousands, AUD in Millions	12 Months Ended				48 Months Ended
	Dec. 31, 2015 AUD carload	Dec. 31, 2015 USD ($) carload	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2014 AUD	Dec. 31, 2014 USD ($)
OPERATING REVENUES | $		$ 2,000,401	$ 1,639,012	$ 1,568,643
Arrium Limited [Member]
Amount invested in capital project					AUD 78.0	$ 77,700
Annual carloads transported | carload	8,300	8,300
OPERATING REVENUES	AUD 83.0	$ 62,000