Related Parties - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Related Party Transaction [Line Items]
Commission earned		$ 74	$ 191
Commission outstanding		14
UES-UK [Member]
Related Party Transaction [Line Items]
UES-UK interest in cast roll joint venture company	25.00%
UES [Member] | Chinese Forged Roll Joint Venture [Member]
Related Party Transaction [Line Items]
Percentage of ownership in joint venture	49.00%
LB Co [Member]
Related Party Transaction [Line Items]
Purchases	1,489	1,538	1,579
Net amount payable	79	61
LB Co paid Corporation for administrative services	150	253	246
Chinese Cast Roll [Member]
Related Party Transaction [Line Items]
Purchases	38	455	480
Net amount payable	$ 0	$ 0