v3.25.2
Cover Page - shares
6 Months Ended
Jun. 30, 2025
Jul. 28, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-38186  
Entity Registrant Name CUSTOM TRUCK ONE SOURCE, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 84-2531628  
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  
Title of 12(b) Security Common Stock, $0.0001 par value per share  
Trading Symbol CTOS  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   226,559,586
Entity Central Index Key 0001709682  
Document Fiscal Year Focus 2025  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Amendment Flag false