Introduction and Basis of Presentation (Details)	Dec. 06, 2021	Jul. 05, 2021	Jun. 01, 2021	Feb. 01, 2021	Jan. 01, 2020	Sep. 08, 2017
MME
Business Acquisition [Line Items]
Percentage of equity interests acquired	100.00%
Business Acquisition, Effective Date of Acquisition	Dec. 06, 2021
ACT
Business Acquisition [Line Items]
Percentage of equity interests acquired		100.00%
Business Acquisition, Effective Date of Acquisition		Jul. 05, 2021
UTXL
Business Acquisition [Line Items]
Percentage of equity interests acquired			100.00%
Business Acquisition, Effective Date of Acquisition			Jun. 01, 2021
Eleos
Business Acquisition [Line Items]
Percentage of equity interests acquired				79.44%
Business Acquisition, Effective Date of Acquisition				Feb. 01, 2021
Warehousing Co
Business Acquisition [Line Items]
Percentage of equity interests acquired					100.00%
Business Acquisition, Effective Date of Acquisition					Jan. 01, 2020
Knight Transportation Company [Member]
Business Acquisition [Line Items]
Ownership Percentage, Shares Outstanding						46.00%
Swift Transportation Company [Member]
Business Acquisition [Line Items]
Ownership Percentage, Shares Outstanding						54.00%