Assets and Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012		Dec. 31, 2011		Oct. 01, 2011
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash-flow hedges	$ (3,599)				$ (10,504)
Foreign currency contract	1,827	[1]
Deferred compensation plan	54,856	[2]	22,987	[2]	21,684	[2]
Total recurring fair value measurements	53,084		14,854		11,180
Cash-flow hedges			(8,034)
Foreign currency contract			(99)
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill			242,800	[3]
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred compensation plan	54,856	[2]	22,987	[2]	21,684	[2]
Total recurring fair value measurements	54,856		22,987		21,684
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash-flow hedges	(3,599)				(10,504)
Foreign currency contract	1,827	[1]
Total recurring fair value measurements	(1,772)		(8,133)		(10,504)
Cash-flow hedges			(8,034)
Foreign currency contract			(99)
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill			$ 242,800	[3]

[1] Includes a foreign currency contract valued at $0.3 million and deferred compensation plan assets valued on a preliminary basis at $27.2 million acquired in the Merger.

[2] Deferred compensation plan assets include mutual funds and cash equivalents for payment of certain non-qualified benefits for retired, terminated and active employees. The fair value of these assets was based on quoted market prices in active markets.

[3] In the fourth quarter of 2011, we completed our annual goodwill impairment review. As a result, we recorded a pre-tax non-cash goodwill impairment charge of $200.5 million in our Residential Filtration reporting unit. The fair value of each reporting unit is determined using a discounted cash flow analysis and market approach. Projecting discounted future cash flows requires us to make significant estimates regarding future revenues and expenses, projected capital expenditures, changes in working capital and the appropriate discount rate. Use of the market approach consists of comparisons to comparable publicly-traded companies that are similar in size and industry. Actual results may differ from those used in our valuations. The implied fair value of goodwill is determined by allocating the fair value of the reporting unit in a manner similar to a purchase price allocation.