Cover
Jul. 08, 2021
Affiliate, Collateralized Security [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jul. 08, 2021
Entity File Number 001-38186
Entity Registrant Name CUSTOM TRUCK ONE SOURCE, INC.
Entity Central Index Key 0001709682
Entity Tax Identification Number 84-2531628
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 7701 Independence Ave
Entity Address, City or Town Kansas City
Entity Address, State or Province MO
Entity Address, Postal Zip Code 64125
City Area Code 816
Local Phone Number 241-4888
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock, $0.0001 par value  
Affiliate, Collateralized Security [Line Items]  
Title of 12(b) Security Common Stock, $0.0001 par value
Trading Symbol CTOS
Security Exchange Name NYSE
Redeemable warrants, exercisable for Common Stock, $0.0001 par value  
Affiliate, Collateralized Security [Line Items]  
Title of 12(b) Security Redeemable warrants, exercisable for Common Stock, $0.0001 par value
Trading Symbol CTOS.WS
Security Exchange Name NYSE