Information Regarding Reportable Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 1,289,345	$ 1,816,132	$ 4,098,877	$ 5,761,795
Investment income	3,022	716	6,874	2,023
Operating income	80,348	133,498	269,582	446,749
Expenditures on long-lived assets	2,763	13,629	15,394	21,096
Goodwill	41,934	41,004	41,934	41,004	$ 41,220
Internal revenue
Segment Reporting Information [Line Items]
Revenue	11,960	12,883	64,138	65,753
Transportation Logistics
Segment Reporting Information [Line Items]
Revenue	1,271,385	1,796,401	4,043,824	5,702,959
Operating income	63,974	120,164	222,827	412,054
Expenditures on long-lived assets	2,763	13,629	15,394	21,096
Goodwill	41,934	41,004	41,934	41,004
Insurance
Segment Reporting Information [Line Items]
Revenue	17,960	19,731	55,053	58,836
Investment income	3,022	716	6,874	2,023
Operating income	16,374	13,334	46,755	34,695
Insurance | Internal revenue
Segment Reporting Information [Line Items]
Revenue	$ 11,960	$ 12,883	$ 64,138	$ 65,753