Changes in Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Incremental to planned contributions			$ 35,000
Balance at beginning of period			2,751,363
Balance at end of period	$ 3,019,972		3,019,972
Accumulated defined benefit plans adjustment attributable to parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period	(102,589)	$ (118,706)	(103,192)	$ (119,363)
Total before income tax	33,913	3,073	34,723	4,147
Income tax provision	8,682	1,193	8,889	1,610
Current period comprehensive income, net of tax	25,231	1,880	25,834	2,537
Balance at end of period	(77,358)	(116,826)	(77,358)	(116,826)
Amortization of prior service cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss, before tax	2	36	5	72
Amortization of net loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss, before tax	731	1,037	1,538	2,075
Pension remeasurement
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss, before tax	33,180	0	33,180	0
Settlements
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss, before tax	0	2,000	0	2,000
Accumulated net gain (loss) from cash flow hedges attributable to parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Balance at beginning of period	16,477	0	7,437	0
AOCI attributable to parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Balance at end of period	(57,237)	(116,826)	(57,237)	(116,826)
Interest Rate Swap | Accumulated net gain (loss) from cash flow hedges attributable to parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Change in fair value of interest rate swaps	5,461	0	17,308	0
Total before income tax	4,898	0	17,048	0
Income tax provision	1,254	0	4,364	0
Current period comprehensive income, net of tax	3,644	0	12,684	0
Balance at end of period	20,121	0	20,121	0
Interest Rate Swap | Amounts reclassified to interest expense—net | Accumulated net gain (loss) from cash flow hedges attributable to parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from other comprehensive loss, before tax	$ (563)	$ 0	$ (260)	$ 0