Condensed Consolidated Balance Sheets (Unaudited) - USD ($) shares in Thousands, $ in Thousands		Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents		$ 166,348	$ 168,545
Cash and cash equivalents – restricted	[1]	150,870	297,275
Restricted investments, held-to-maturity, amortized cost		0	530
Trade receivables, net of allowance for doubtful accounts of $39,298 and $39,458, respectively		835,248	888,603
Contract balance – revenue in transit		11,056	12,246
Prepaid expenses		114,793	148,696
Assets held for sale		74,787	83,366
Income tax receivable		46,191	65,815
Other current assets		38,330	43,939
Total current assets		1,437,623	1,709,015
Gross property and equipment		7,081,485	6,720,610
Less: accumulated depreciation and amortization		(2,322,511)	(2,104,211)
Property and equipment, net		4,758,974	4,616,399
Operating lease right-of-use-assets		415,856	484,821
Goodwill		3,963,142	3,848,798
Intangible assets, net		2,075,315	2,058,882
Other long-term assets		173,871	152,850
Total assets		12,824,781	12,870,765
Current liabilities:
Accounts payable		293,244	355,173
Accrued payroll and purchased transportation		190,830	164,884
Accrued liabilities		207,143	220,350
Claims accruals – current portion		336,010	480,200
Finance lease liabilities and long-term debt – current portion		272,355	459,759
Operating lease liabilities – current portion		129,938	144,921
Total current liabilities		1,429,520	1,825,287
Revolving line of credit		227,000	67,000
Long-term debt – less current portion		1,501,565	1,223,021
Finance lease liabilities – less current portion		466,863	407,150
Operating lease liabilities – less current portion		310,584	371,407
Accounts receivable securitization		458,911	526,508
Claims accruals – less current portion		328,968	315,476
Deferred tax liabilities		920,685	951,749
Other long-term liabilities		114,469	79,086
Total liabilities		5,758,565	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; 161,871 and 161,385 shares issued and outstanding as of September 30, 2024 and December 31, 2023, respectively.		$ 1,619	$ 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)		161,871	161,385
Common stock, shares outstanding (in shares)		161,871	161,385
Additional paid-in capital		$ 4,439,029	$ 4,426,852
Accumulated other comprehensive income (loss)		168	(830)
Retained earnings		2,617,880	2,659,755
Total Knight-Swift stockholders' equity		7,058,696	7,087,390
Noncontrolling interest		7,520	16,691
Total stockholders’ equity		7,066,216	7,104,081
Total liabilities and stockholders’ equity		$ 12,824,781	$ 12,870,765
Common Class A [Member]
Stockholders’ equity:
Common stock, shares outstanding (in shares)		161,871	161,385

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