Information Regarding Reportable Business Segments (Detail) - USD ($)	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Segment Reporting Information [Line Items]
External revenue	$ 6,537,568,000	$ 4,132,981,000	$ 4,084,577,000
Internal revenue	62,558,000	54,003,000	46,587,000
Investment income	2,857,000	3,399,000	5,041,000
Interest and debt expense	3,976,000	3,953,000	3,141,000
Depreciation and amortization	49,609,000	45,855,000	44,468,000
Operating income	505,668,000	252,950,000	298,904,000
Expenditures on long-lived assets	23,261,000	30,626,000	19,416,000
Goodwill	40,768,000	40,949,000	38,508,000
Finance lease additions	48,674,000	31,633,000	29,054,000
Total assets	2,045,465,000	1,653,799,000	1,427,711,000
Transportation Logistics
Segment Reporting Information [Line Items]
External revenue	6,465,711,000	4,076,519,000	4,028,336,000
Interest and debt expense	3,976,000	3,953,000	3,141,000
Depreciation and amortization	49,609,000	45,855,000	44,468,000
Operating income	464,282,000	221,210,000	258,742,000
Expenditures on long-lived assets	23,261,000	30,626,000	19,416,000
Goodwill	40,768,000	40,949,000	38,508,000
Finance lease additions	48,674,000	31,633,000	29,054,000
Total assets	1,736,854,000	1,301,991,000	1,168,944,000
Insurance
Segment Reporting Information [Line Items]
External revenue	71,857,000	56,462,000	56,241,000
Internal revenue	62,558,000	54,003,000	46,587,000
Investment income	2,857,000	3,399,000	5,041,000
Operating income	41,386,000	31,740,000	40,162,000
Total assets	$ 308,611,000	$ 351,808,000	$ 258,767,000