Acquisition - Additional Information (Detail)	6 Months Ended		1 Months Ended			3 Months Ended	6 Months Ended	3 Months Ended		1 Months Ended
	Jun. 30, 2012 USD ($)	Jul. 02, 2011 USD ($)	Apr. 04, 2012 Sibrape [Member] USD ($) Year	May 12, 2011 CPT USD ($)	May 12, 2011 CPT EUR (€)	Jul. 02, 2011 CPT USD ($)	Jul. 02, 2011 CPT USD ($)	Apr. 02, 2011 Business Acquisition Pro Forma Information USD ($)	Jan. 31, 2011 Hidro Filtros USD ($)	Jan. 31, 2011 Hidro Filtros Customer relationships USD ($)	Dec. 31, 2011 Other small acquisitions adding to Water Group USD ($)
Business Acquisition [Line Items]
Acquisitions, net of cash acquired	$ 19,905,000	$ 733,105,000	$ 19,900,000
Goodwill			8,800,000	451,800,000					10,100,000		4,300,000
Definite-lived intangibles			4,800,000							5,500,000
Estimated life of intangible assets			11
Business acquisition purchase price				715,300,000	502,700,000						4,600,000
Intangibles				197,200,000					6,300,000
Weighted average amortization period				10 years	10 years
Fair value adjustments of inventory and customer backlog								5,500,000
Total transaction costs related to acquisition activities						6,100,000	7,800,000
Cash paid									14,900,000		2,900,000
Note payable issued									$ 2,100,000		$ 1,700,000
Estimated life										13 years