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Quarterly Operating Results (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 27, 2015 | Jun. 28, 2015 | Mar. 29, 2015 | Dec. 31, 2014 | Sep. 28, 2014 | Jun. 29, 2014 | Mar. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance and other restructuring costs | $ 13,600 | $ 14,100 | $ 4,900 | $ 14,600 | $ 22,000 | $ 9,200 | $ 38,200 | $ 1,400 | $ 47,170 | $ 70,827 | $ 14,888
Purchase accounting effects related to acquisitions |  |  |  |  |  |  | $ 7,400 |  |  |  |
Tripwire [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  |  |  | $ 9,200 |  |  |  |  | $ 9,200 |  |

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