Summary of Financial Information by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Segment Reporting Information [Line Items]
Revenues	$ 548,484		$ 614,682		$ 1,765,854		$ 1,757,228
Operating income	89,052		106,580		276,879		292,575
Interest expense	3,739		2,898		11,540		12,179
Other expense (income), net	(1,252)		(138)		(2,832)		(821)
Consolidated income before income taxes	86,565		103,820		268,171		281,217
Industrial Products Group
Segment Reporting Information [Line Items]
Revenues	311,767		320,171		967,316		934,227
Operating income	39,402	[1]	38,607	[1]	95,765	[1]	103,734	[1]
Operating income as a percentage of revenues	12.60%		12.10%		9.90%		11.10%
Engineered Products Group
Segment Reporting Information [Line Items]
Revenues	236,717		294,511		798,538		823,001
Operating income	$ 49,650	[1]	$ 67,973	[1]	$ 181,114	[1]	$ 188,841	[1]
Operating income as a percentage of revenues	21.00%		23.10%		22.70%		22.90%

[1] See Note 3 "Restructuring."