Organization and Operations (Details) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($) item $ / shares shares	Dec. 31, 2021 segment $ / shares shares	Dec. 31, 2021 $ / shares shares	Dec. 31, 2020 $ / shares shares
Organization and Operations [Line Items]
Number of reportable segments		2	2
Proceeds from IPO | $	$ 246.6
Preferred stock, shares authorized (in shares)		9,333,333	9,333,333
Common Stock Class A
Organization and Operations [Line Items]
Number of shares issued per share in reorganization	4.6666667
Votes per share | item	1
Issuance of shares (in shares)	16,668,000
Share price (in dollars per share) | $ / shares	$ 16
Common stock, shares authorized (in shares)		140,000,000	140,000,000	140,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01	$ 0.01
Common Stock Class B
Organization and Operations [Line Items]
Number of shares issued per share in reorganization	4.6666667
Votes per share | item	5
Common stock, shares authorized (in shares)		35,000,000	35,000,000	35,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01	$ 0.01
New Mountain Lake Holdings, LLC [Member] | US Xpress Enterprises Inc [Member]
Organization and Operations [Line Items]
Ownership by parent (as a percent)		100.00%	100.00%