Investments And Marketable Securities (Narrative) (Detail) (USD $)	6 Months Ended	9 Months Ended
Jun. 30, 2012	Sep. 29, 2012	Oct. 01, 2011	Dec. 31, 2011
Percentage of ownership interest	2.70%
Purchase of long-term equity investment	$ 5,000,000	$ 5,000,000	$ 0
Foreign cash and investments		$ 153,693,000		$ 96,829,000

The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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