Information Regarding Reportable Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021	Dec. 25, 2021
Segment Reporting Information [Line Items]
External revenue	$ 1,975,064	$ 1,570,718	$ 3,945,663	$ 2,858,252
Internal revenue	39,986	33,961	52,870	43,495
Investment income	586	748	1,307	1,432
Operating income	150,418	122,248	313,251	225,516
Expenditures on long-lived assets	3,858	4,924	7,467	9,000
Goodwill	40,977	40,973	40,977	40,973	$ 40,768
Transportation Logistics
Segment Reporting Information [Line Items]
External revenue	1,955,219	1,553,058	3,906,558	2,823,557
Operating income	139,944	110,228	291,890	199,960
Expenditures on long-lived assets	3,858	4,924	7,467	9,000
Goodwill	40,977	40,973	40,977	40,973
Insurance
Segment Reporting Information [Line Items]
External revenue	19,845	17,660	39,105	34,695
Internal revenue	39,986	33,961	52,870	43,495
Investment income	586	748	1,307	1,432
Operating income	$ 10,474	$ 12,020	$ 21,361	$ 25,556