Investments in Joint Ventures - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Chinese Cast Roll Joint Venture [Member]	Dec. 31, 2013 UES [Member]	Sep. 30, 2013 UES [Member]	Dec. 31, 2012 UES [Member]	Sep. 30, 2012 UES [Member]	Dec. 31, 2011 UES [Member]	Sep. 30, 2011 UES [Member]	Dec. 31, 2013 Maanshan [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of ownership in joint venture						49.00%						51.00%
Cash payment for joint venture						$ 14,700
Commission earned			74	191				74		191
Commission outstanding			14					14
Losses of the joint venture approximated							(4,203)		(3,254)		(1,024)
Percentage of intercompany profit						49.00%
Joint venture recognized impairment charge	6,407	6,407
Carrying value investment	3,670	3,670
Percentage of ownership in Chinese cast roll joint venture					25.00%
Recorded cost in Chinese cast roll joint venture					1,340
Dividend declared						$ 0		$ 0		$ 0