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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 | 9 Months Ended
--- | --- | ---
Oct. 01, 2017 | Oct. 02, 2016 | Oct. 01, 2017 | Oct. 02, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Consolidated Revenues | $ 621,745 | $ 601,109 | $ 1,783,759 | $ 1,744,237
Amortization of intangibles | (27,162) | (23,808) | (77,944) | (75,603)
Severance, restructuring, and acquisition integration costs | (16,679) | (12,795) | (32,839) | (27,072)
Depreciation expense | (11,700) | (11,600) | (34,600) | (35,300)
Operating income | 60,791 | 61,980 | 174,609 | 165,185
Interest expense, net | (19,385) | (23,513) | (66,424) | (71,958)
Loss on debt extinguishment | (51,594) | 0 | (52,441) | 0
Income before taxes | (10,188) | 38,467 | 55,744 | 93,227
Reportable Segment |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Total Segment Revenues | 621,745 | 602,468 | 1,783,759 | 1,749,649
Deferred revenue adjustments | 0 | (1,359) | 0 | (5,412)
Consolidated Revenues | 621,745 | 601,109 | 1,783,759 | 1,744,237
Total Segment EBITDA | 117,531 | 111,936 | 320,868 | 310,337
Amortization of intangibles | (27,162) | (23,808) | (77,944) | (75,603)
Severance, restructuring, and acquisition integration costs | (16,679) | (12,795) | (32,839) | (27,072)
Depreciation expense | (11,683) | (11,603) | (34,594) | (35,253)
Purchase accounting effects related to acquisitions | (2,922) | 0 | (4,089) | (195)
Deferred gross profit adjustments | 0 | (1,359) | 0 | (5,412)
Income from equity method investment | 2,551 | 586 | 5,835 | 1,077
Eliminations |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Operating income | $ (845) | $ (977) | $ (2,628) | $ (2,694)

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