Business Segments - Business Segment Net Sales and Income Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue from External Customer [Line Items]
Net sales	$ 69,938	$ 69,956	$ 139,562	$ 143,561
Income before Income Taxes	1,931	2,659	2,998	6,500
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales	69,938	69,956	139,562	143,561
Income before Income Taxes	4,689	5,474	8,962	12,088
Operating Segments [Member] | Forged and Cast Rolls [Member]
Revenue from External Customer [Line Items]
Net sales	45,386	43,584	90,499	87,532
Income before Income Taxes	2,611	3,240	4,674	7,380
Operating Segments [Member] | Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Net sales	24,552	26,372	49,063	56,029
Income before Income Taxes	2,078	2,234	4,288	4,708
Other Expense, Including Corporate Costs, Net [Member]
Revenue from External Customer [Line Items]
Income before Income Taxes	$ (2,758)	$ (2,815)	$ (5,964)	$ (5,588)