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Segment Information - Summary of Unallocated Corporate Overhead (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 24, 2016 | Sep. 30, 2017 | Sep. 24, 2016
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | $ 11,526 | $ 10,600 | $ 32,902 | $ 32,647
Unallocated corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Stock-based compensation | 7,255 | 6,739 | 20,259 | 20,593
Compensation, benefits, and other employee-related expenses | 11,771 | 9,048 | 37,812 | 29,327
External consulting and other service expenses | 6,729 | 4,545 | 16,581 | 16,377
Information technology | 3,237 | 2,903 | 9,247 | 8,399
Depreciation | 2,287 | 2,011 | 6,378 | 5,593
Acquisition and integration | 1,327 | 2,033 | 2,539 | 13,056
Other general unallocated corporate | 2,675 | 3,164 | 8,965 | 9,343
Total unallocated corporate expense | $ 35,281 | $ 30,443 | $ 101,781 | $ 102,688

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