Summery of Information by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 513,541		$ 604,356
Operating income	63,377		79,792
Interest expense	2,677		3,834
Other income, net	(1,308)		(1,223)
Consolidated income before income taxes	62,008		77,181
Industrial Products Group
Segment Reporting Information [Line Items]
Revenues	301,852		325,827
Operating income	29,843	[1]	15,539	[1]
Operating income as a percentage of revenues	9.90%		4.80%
Engineered Products Group
Segment Reporting Information [Line Items]
Revenues	211,690		278,529
Operating income	$ 33,534		$ 64,253
Operating income as a percentage of revenues	15.80%		23.10%

[1] (1) See Note 3 "Restructuring."