v2.4.0.6
Document And Entity Information
3 Months Ended
Mar. 31, 2012
May 04, 2012
Common Stock [Member]
May 04, 2012
Class B Common Stock [Member]
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Mar. 31, 2012    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus Q1    
Trading Symbol WSO    
Entity Filer Category Large Accelerated Filer    
Entity Registrant Name WATSCO INC    
Entity Central Index Key 0000105016    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   29,682,083 4,709,432