Information Regarding Reportable Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023	Dec. 30, 2023
Segment Reporting Information [Line Items]
Revenue	$ 1,213,867	$ 1,289,345	$ 3,609,915	$ 4,098,877
Investment income	3,922	3,022	10,988	6,874
Operating income	63,116	80,348	191,136	269,582
Expenditures on long-lived assets	7,478	2,763	24,256	15,394
Goodwill	41,122	41,934	41,122	41,934	$ 42,275
Related Party
Segment Reporting Information [Line Items]
Revenue	12,065	11,960	65,411	64,138
Transportation Logistics
Segment Reporting Information [Line Items]
Revenue	1,198,334	1,271,385	3,561,941	4,043,824
Operating income	47,618	63,974	141,070	222,827
Expenditures on long-lived assets	7,478	2,763	24,256	15,394
Goodwill	41,122	41,934	41,122	41,934
Insurance
Segment Reporting Information [Line Items]
Revenue	15,533	17,960	47,974	55,053
Investment income	3,922	3,022	10,988	6,874
Operating income	15,498	16,374	50,066	46,755
Insurance | Related Party
Segment Reporting Information [Line Items]
Revenue	$ 12,065	$ 11,960	$ 65,411	$ 64,138