Information Regarding Reportable Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2022	Mar. 27, 2021	Dec. 25, 2021
Segment Reporting Information [Line Items]
External revenue	$ 1,970,599	$ 1,287,534
Internal revenue	12,884	9,534
Investment income	721	684
Operating income	162,833	103,268
Expenditures on long-lived assets	3,609	4,076
Goodwill	40,945	40,732	$ 40,768
Transportation Logistics
Segment Reporting Information [Line Items]
External revenue	1,951,339	1,270,499
Operating income	151,946	89,732
Expenditures on long-lived assets	3,609	4,076
Goodwill	40,945	40,732
Insurance
Segment Reporting Information [Line Items]
External revenue	19,260	17,035
Internal revenue	12,884	9,534
Investment income	721	684
Operating income	$ 10,887	$ 13,536