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Changes in Carrying Amount of Goodwill by Segment (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Sep. 29, 2012 | Dec. 31, 2011 | Oct. 01, 2011
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Accumulated goodwill impairment losses | $ 200.5 | $ 200.5 | $ 0

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- Definition The accumulated impairment losses related to goodwill as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration