XML 14 R2.htm IDEA: XBRL DOCUMENT v3.20.2
Cover Page Document - shares
9 Months Ended
Sep. 26, 2020
Oct. 30, 2020
Document Information [Line Items]    
Document type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity file number 000-11917  
Entity registrant name THE DAVEY TREE EXPERT COMPANY  
Entity current reporting status Yes  
Entity interactive data current Yes  
Entity common stock, shares outstanding   22,651,885
Document period end date Sep. 26, 2020