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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 20, 2024
Jun. 30, 2023
Document Information [Line Items]      
Document Type 10-K    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Amendment Flag false    
Entity Registrant Name WATSCO, INC.    
Entity Central Index Key 0000105016    
Entity File Number 1-5581    
Entity Incorporation, State or Country Code FL    
Document Annual Report true    
Document Transition Report false    
Entity Address, City or Town Miami    
Entity Tax Identification Number 59-0778222    
Entity Address, Address Line One 2665 South Bayshore Drive    
Entity Address, Postal Zip Code 33133    
Entity Address, Address Line Two Suite 901    
Entity Address, State or Province FL    
City Area Code 305    
Local Phone Number 714-4100    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 12,929
ICFR Auditor Attestation Flag true    
Auditor Firm ID 34    
Auditor Name Deloitte & Touche LLP    
Auditor Location Miami, FL    
Document Financial Statement Error Correction [Flag] false    
KPMG LLP [Member]      
Document Information [Line Items]      
Auditor Firm ID 185    
Auditor Name KPMG LLP    
Auditor Location Miami, FL    
Common Stock [Member]      
Document Information [Line Items]      
Trading Symbol WSO    
Security Exchange Name NYSE    
Title of 12(b) Security Common stock, $0.50 par value    
Entity Common Stock, Shares Outstanding   33,934,349  
Common Class B [Member]      
Document Information [Line Items]      
Trading Symbol WSOB    
Security Exchange Name NYSE    
Title of 12(b) Security Class B common stock, $0.50 par value    
Entity Common Stock, Shares Outstanding   5,562,249