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Operating Segments - Reconciliation of Total Reportable Segments' Revenues and EBITDA to Consolidated Revenues and Consolidated Income from Continuing Operations Before Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 01, 2018 | Apr. 02, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Consolidated Revenues | $ 605,565 | $ 551,381
Amortization of intangibles | (24,418) | (23,669)
Severance, restructuring, and acquisition integration costs | (20,394) | (6,600)
Depreciation expense | (11,900) | (11,400)
Operating income | 44,203 | 51,597
Interest expense, net | (16,978) | (23,506)
Non-operating pension costs | (275) | (260)
Loss on debt extinguishment | (19,960) | 0
Income before taxes | 6,990 | 27,831
Reportable Segment |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Total Segment Revenues | 607,423 | 551,381
Deferred revenue adjustments | (1,858) | 0
Consolidated Revenues | 605,565 | 551,381
Total Segment EBITDA | 103,878 | 93,370
Amortization of intangibles | (24,418) | (23,669)
Severance, restructuring, and acquisition integration costs | (20,394) | (6,600)
Depreciation expense | (11,865) | (11,383)
Purchase accounting effects related to acquisitions | (502) | 0
Amortization of software development costs | (236) | 0
Loss on sale of assets | (94) | 0
Income from equity method investment | 0 | 1,007
Eliminations |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Operating income | $ (308) | $ (1,128)

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