Note 9 - Segment Information - Revenues and Operating Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Operating revenues		$ 2,921,392	$ 2,944,001
Salaries, wages and employee benefits		799,648	807,884
Depreciation and amortization		179,476	182,996
General and administrative expenses, net of asset dispositions		72,971	76,784
Total operating expenses		2,742,700	2,749,600
Operating income	[1]	178,680	194,369
Operating Segments [Member] | JBI [Member]
Operating revenues		1,469,300	1,395,500
Rents, purchased transportation, and fuel		927,000	879,600
Salaries, wages and employee benefits		219,000	201,200
Depreciation and amortization		60,600	60,400
Operating supplies and expenses		62,200	57,700
Insurance and claims		28,700	24,400
General and administrative expenses, net of asset dispositions		69,200	62,300
Other segment items	[2]	8,200	8,000
Total operating expenses		1,374,900	1,293,600
Operating income	[1]	94,400	101,900
Operating Segments [Member] | DCS [Member]
Operating revenues		822,300	860,000
Rents, purchased transportation, and fuel		109,200	121,300
Salaries, wages and employee benefits		371,400	382,800
Depreciation and amortization		79,800	82,200
Operating supplies and expenses		70,400	69,400
Insurance and claims		44,000	40,300
General and administrative expenses, net of asset dispositions		52,600	55,400
Other segment items	[2]	14,600	15,000
Total operating expenses		742,000	766,400
Operating income	[1]	80,300	93,600
Operating Segments [Member] | ICS [Member]
Operating revenues		268,000	285,300
Rents, purchased transportation, and fuel		229,000	246,700
Salaries, wages and employee benefits		16,800	21,000
Depreciation and amortization		2,000	3,300
Operating supplies and expenses		1,500	1,600
Insurance and claims		4,600	8,400
General and administrative expenses, net of asset dispositions		16,600	21,500
Other segment items	[2]	200	300
Total operating expenses		270,700	302,800
Operating income	[1]	(2,700)	(17,500)
Operating Segments [Member] | FMS [Member]
Operating revenues		200,700	229,300
Rents, purchased transportation, and fuel		71,900	80,700
Salaries, wages and employee benefits		70,600	80,300
Depreciation and amortization		11,300	11,700
Operating supplies and expenses		10,100	10,900
Insurance and claims		6,300	1,800
General and administrative expenses, net of asset dispositions		23,700	26,300
Other segment items	[2]	2,100	2,500
Total operating expenses		196,000	214,200
Operating income	[1]	4,700	15,100
Operating Segments [Member] | JBT [Member]
Operating revenues		166,600	178,300
Rents, purchased transportation, and fuel		121,400	130,100
Salaries, wages and employee benefits		10,400	11,200
Depreciation and amortization		8,700	9,100
Operating supplies and expenses		6,800	7,200
Insurance and claims		5,600	6,600
General and administrative expenses, net of asset dispositions		11,300	12,300
Other segment items	[2]	400	600
Total operating expenses		164,600	177,100
Operating income	[1]	2,000	1,200
Intersegment Eliminations [Member]
Operating revenues		(5,500)	(4,400)
Total operating expenses		(5,500)	(4,500)
Operating income	[1]	$ 0	$ 100

[1] Refer to the Condensed Consolidated Statements of Earnings for the reconciliation of consolidated operating income to earnings before income taxes.

[2] Other segment items include communication, utilities, and operating taxes and licenses expense items