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Additional Balance Sheet and Cash Flow Information (Marketable Securities) (Detail) - USD ($) $ in Thousands	Jun. 25, 2017	Dec. 31, 2016	Jun. 26, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Available-for-sale securities: corporate bonds	$ 0	$ 5,519	$ 5,070
Trading securities: mutual funds	44,156	38,119	37,651
Marketable Securities	$ 44,156	$ 43,638	$ 42,721

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

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Reference 3: 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)
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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562

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