Additional Balance Sheet And Cash Flow Information (Marketable Securities) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2015	Dec. 31, 2014	Mar. 30, 2014
Supplemental Cash Flow Information [Abstract]
Available-for-sale securities	$ 57,219us-gaap_AvailableForSaleSecurities	$ 57,325us-gaap_AvailableForSaleSecurities	$ 92,940us-gaap_AvailableForSaleSecurities
Trading Securities	37,667us-gaap_TradingSecurities	33,815us-gaap_TradingSecurities	33,182us-gaap_TradingSecurities
Marketable Securities	$ 94,886us-gaap_MarketableSecurities	$ 91,140us-gaap_MarketableSecurities	$ 126,122us-gaap_MarketableSecurities

Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_TradingSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant