Condensed Consolidated Balance Sheets (Unaudited) - USD ($) shares in Thousands, $ in Thousands		Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents		$ 186,473	$ 168,545
Cash and cash equivalents – restricted	[1]	149,571	297,275
Restricted investments, held-to-maturity, amortized cost		0	530
Trade receivables, net of allowance for doubtful accounts of $39,720 and $39,458, respectively		841,619	888,603
Contract balance – revenue in transit		14,267	12,246
Prepaid expenses		112,998	148,696
Assets held for sale		72,480	83,366
Income tax receivable		39,266	65,815
Other current assets		33,541	43,939
Total current assets		1,450,215	1,709,015
Gross property and equipment		6,917,535	6,720,610
Less: accumulated depreciation and amortization		(2,292,930)	(2,104,211)
Property and equipment, net		4,624,605	4,616,399
Operating lease right-of-use-assets		422,433	484,821
Goodwill		3,879,442	3,848,798
Intangible assets, net		2,021,838	2,058,882
Other long-term assets		171,792	152,850
Total assets		12,570,325	12,870,765
Current liabilities:
Accounts payable		300,585	355,173
Accrued payroll and purchased transportation		183,858	164,884
Accrued liabilities		197,801	220,350
Claims accruals – current portion		358,553	480,200
Finance lease liabilities and long-term debt – current portion		485,907	459,759
Operating lease liabilities – current portion		123,396	144,921
Total current liabilities		1,650,100	1,825,287
Revolving line of credit		120,000	67,000
Long-term debt – less current portion		1,173,121	1,223,021
Finance lease liabilities – less current portion		434,405	407,150
Operating lease liabilities – less current portion		326,752	371,407
Accounts receivable securitization		452,039	526,508
Claims accruals – less current portion		313,856	315,476
Deferred tax liabilities		910,882	951,749
Other long-term liabilities		118,817	79,086
Total liabilities		5,499,972	5,766,684
Commitments and contingencies (Notes 7, 8, and 9)
Stockholders’ equity:
Preferred stock, par value $0.01 per share; 10,000 shares authorized; none issued		$ 0	$ 0
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)		10,000	10,000
Preferred stock, shares issued (in shares)		0	0
Common stock, par value $0.01 per share; 500,000 shares authorized; 161,836 and 161,385 shares issued and outstanding as of June 30, 2024 and December 31, 2023, respectively.		$ 1,618	$ 1,613
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common stock, shares authorized (in shares)		500,000	500,000
Common stock, shares issued (in shares)		161,836	161,385
Common stock, shares outstanding (in shares)		161,836	161,385
Additional paid-in capital		$ 4,439,489	$ 4,426,852
Accumulated other comprehensive loss		(827)	(830)
Retained earnings		2,613,684	2,659,755
Total Knight-Swift stockholders' equity		7,053,964	7,087,390
Noncontrolling interest		16,389	16,691
Total stockholders’ equity		7,070,353	7,104,081
Total liabilities and stockholders’ equity		$ 12,570,325	$ 12,870,765
Common Class A [Member]
Stockholders’ equity:
Common stock, shares outstanding (in shares)		161,836	161,385

[1] Reflects cash and cash equivalents that are primarily restricted for claims payments.