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Cash, Cash Equivalents, and Investments (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
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Sep. 29, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018
Cash and Cash Equivalents [Abstract] |  |  |  |
Gross realized gains on sale of investments | $ 361,000 | $ 283,000 | $ 818,000 | $ 646,000
Gross realized losses on sale of investments | $ 67,000 | $ 17,000 | $ 103,000 | $ 111,000

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CashAndCashEquivalentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration