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Document And Entity Information
Oct. 29, 2025
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 29, 2025
Entity Registrant Name WATSCO, INC.
Entity Central Index Key 0000105016
Entity Emerging Growth Company false
Entity File Number 1-5581
Entity Incorporation, State or Country Code FL
Entity Tax Identification Number 59-0778222
Entity Address, Address Line One 2665 South Bayshore Drive
Entity Address, Address Line Two Suite 901
Entity Address, City or Town Miami
Entity Address, State or Province FL
Entity Address, Postal Zip Code 33133
City Area Code (305)
Local Phone Number 714-4100
Entity Information, Former Legal or Registered Name N/A
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Common Class B [Member]  
Document Information [Line Items]  
Title of 12(b) Security Class B common stock, $0.50 par value
Trading Symbol WSOB
Security Exchange Name NYSE
Common Stock [Member]  
Document Information [Line Items]  
Title of 12(b) Security Common stock, $0.50 par value
Trading Symbol WSO
Security Exchange Name NYSE