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Investments - Gross Unrealized Gains and (Losses) Aggregated by Investment Category (Parenthetical) (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 27, 2016 | Dec. 31, 2016 | Dec. 31, 2016
Schedule of Cost-method Investments [Line Items] |  |  |
Impairment charges |  |  | $ 5,000
Minority Interest in Private Company [Member] |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Investments in minority interest | $ 9,300 |  |
Impairment charges |  | $ 5,000 | $ 5,000

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