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Schedule of Realized Gains and (Losses) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2014 | Sep. 29, 2013 | Sep. 28, 2014 | Sep. 29, 2013
Available For Sale Investment Securities Gross Realized Gain Losses [Line Items] |  |  |  |
Realized gains | $ 986 | $ 235 | $ 1,677 | $ 569
Realized (losses) |  |  |  |

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