Financial Information By Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 31, 2010	Oct. 02, 2010	Jul. 03, 2010	Apr. 03, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Net sales	$ 865,692	$ 890,546	$ 910,175	$ 790,273	$ 753,858	$ 773,735	$ 796,167	$ 707,013	$ 3,456,686	$ 3,030,773	$ 2,692,468
Operating income (loss)	(119,985)	92,903	109,422	86,177	79,605	90,823	100,126	63,601	168,517	334,155	219,948
Amortization									41,897	26,184	40,657
Capital expenditures									73,348	59,523	54,137
Water & Fluid Solutions
Segment Reporting Information [Line Items]
Net sales									2,369,804	2,041,281	1,847,764
Operating income (loss)									58,311	231,588	163,745
Amortization									39,451	22,981	34,919
Capital expenditures									49,241	39,631	36,513
Technical Products
Segment Reporting Information [Line Items]
Net sales									1,086,882	989,492	844,704
Operating income (loss)									185,240	151,533	100,355
Amortization									2,446	2,610	2,687
Capital expenditures									15,806	8,336	15,388
Significant Reconciling Items
Segment Reporting Information [Line Items]
Operating income (loss)									(75,034)	(48,966)	(44,152)
Amortization										593	3,051
Capital expenditures									$ 8,301	$ 11,556	$ 2,236