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Information Regarding Reportable Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
External revenue	$ 1,182,351	$ 1,202,081	$ 1,182,786	$ 1,047,926	$ 1,051,592	$ 943,430	$ 870,434	$ 780,908	$ 4,615,144	$ 3,646,364	$ 3,167,634
Internal revenue									37,872	37,110	36,118
Investment income									3,816	2,498	1,502
Interest and debt expense									3,354	3,166	3,794
Depreciation and amortization									43,570	40,560	35,796
Operating income	86,088	$ 87,068	$ 83,426	$ 75,153	70,049	$ 60,567	$ 61,018	$ 52,334	331,735	243,968	223,251
Expenditures on long-lived assets									9,747	15,586	22,645
Goodwill	38,232				39,065				38,232	39,065	31,134
Capital lease additions									46,595	33,560	61,504
Total assets	1,380,564				1,352,460				1,380,564	1,352,460	1,096,591
Transportation Logistics
Segment Reporting Information [Line Items]
External revenue									4,562,796	3,599,382	3,121,210
Interest and debt expense									3,354	3,166	3,794
Depreciation and amortization									43,570	40,560	35,796
Operating income									303,426	209,615	187,813
Expenditures on long-lived assets									9,747	15,586	22,645
Goodwill	38,232				39,065				38,232	39,065	31,134
Capital lease additions									46,595	33,560	61,504
Total assets	1,175,040				1,132,766				1,175,040	1,132,766	913,667
Insurance
Segment Reporting Information [Line Items]
External revenue									52,348	46,982	46,424
Internal revenue									37,872	37,110	36,118
Investment income									3,816	2,498	1,502
Operating income									28,309	34,353	35,438
Total assets	$ 205,524				$ 219,694				$ 205,524	$ 219,694	$ 182,924

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